[509735] Add workflow page and backend services

Bug: 509735
Change-Id: I07782d5d594b885d58744973391518c44e1c06a7
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>

67 files changed, 3542 insertions, 5 deletions

diff --git a/plugins/org.eclipse.sirius.server.backend/META-INF/MANIFEST.MF b/plugins/org.eclipse.sirius.server.backend/META-INF/MANIFEST.MF
index f989dfbfc1..844b0954e6 100644
--- a/plugins/org.eclipse.sirius.server.backend/META-INF/MANIFEST.MF
+++ b/plugins/org.eclipse.sirius.server.backend/META-INF/MANIFEST.MF
@@ -18,7 +18,11 @@ Require-Bundle: org.eclipse.core.runtime;bundle-version="3.8.0",
  org.eclipse.sirius.table;bundle-version="6.0.0",
  org.eclipse.sirius.tree;bundle-version="6.0.0",
  org.eclipse.sirius.server;bundle-version="6.0.0",
- com.google.gson;bundle-version="2.7.0"
+ com.google.gson;bundle-version="2.7.0",
+ org.eclipse.sirius.workflow.model;bundle-version="6.0.0",
+ org.eclipse.sirius.ecore.extender;bundle-version="6.0.0",
+ org.eclipse.emf.transaction;bundle-version="1.9.0",
+ org.eclipse.sirius.common;bundle-version="6.0.0"
 Bundle-Localization: plugin
 Export-Package: org.eclipse.sirius.server.backend.internal;x-friends:="org.eclipse.sirius.tests.server.backend",
  org.eclipse.sirius.server.backend.internal.services.dashboard;x-internal:=true,
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/SiriusServerBackendFilter.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/SiriusServerBackendFilter.java
index 661e5b32fe..6c8f2b495d 100644
--- a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/SiriusServerBackendFilter.java
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/SiriusServerBackendFilter.java
@@ -29,7 +29,9 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Status;
+import org.eclipse.sirius.server.backend.internal.services.activities.SiriusServerActivityExecutorService;
 import org.eclipse.sirius.server.backend.internal.services.dashboard.SiriusServerDashboardService;
+import org.eclipse.sirius.server.backend.internal.services.pages.SiriusServerPageService;
 import org.eclipse.sirius.server.backend.internal.services.project.SiriusServerProjectService;
 import org.eclipse.sirius.server.backend.internal.services.projects.SiriusServerProjectsService;
 
@@ -120,6 +122,8 @@ public class SiriusServerBackendFilter implements Filter {
         serviceClasses.add(SiriusServerDashboardService.class);
         serviceClasses.add(SiriusServerProjectsService.class);
         serviceClasses.add(SiriusServerProjectService.class);
+        serviceClasses.add(SiriusServerPageService.class);
+        serviceClasses.add(SiriusServerActivityExecutorService.class);
 
         List<SiriusServerServiceDescriptor> descriptors = new ArrayList<>();
         for (Class<? extends ISiriusServerService> serviceClass : serviceClasses) {
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/activities/SiriusServerActivityExecutorService.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/activities/SiriusServerActivityExecutorService.java
new file mode 100644
index 0000000000..138406d3ef
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/activities/SiriusServerActivityExecutorService.java
@@ -0,0 +1,105 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.activities;
+
+import static org.eclipse.sirius.server.backend.internal.SiriusServerResponse.STATUS_NOT_FOUND;
+import static org.eclipse.sirius.server.backend.internal.SiriusServerResponse.STATUS_OK;
+
+import java.util.Map;
+import java.util.Optional;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.ecore.util.EcoreUtil;
+import org.eclipse.emf.transaction.RecordingCommand;
+import org.eclipse.emf.transaction.TransactionalEditingDomain;
+import org.eclipse.sirius.business.api.modelingproject.ModelingProject;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.business.internal.session.danalysis.DAnalysisSessionImpl;
+import org.eclipse.sirius.server.backend.internal.ISiriusServerService;
+import org.eclipse.sirius.server.backend.internal.SiriusServerPath;
+import org.eclipse.sirius.server.backend.internal.SiriusServerResponse;
+import org.eclipse.sirius.server.backend.internal.services.workflow.SiriusToolServices;
+import org.eclipse.sirius.server.backend.internal.services.workflow.WorkflowHelper;
+import org.eclipse.sirius.server.backend.internal.utils.SiriusServerUtils;
+import org.eclipse.sirius.viewpoint.DAnalysis;
+import org.eclipse.sirius.workflow.ActivityDescription;
+
+/**
+ * The service used to execute a specific activity of a workflow.
+ *
+ * @author sbegaudeau
+ */
+@SiriusServerPath("/projects/{projectName}/pages/{pageIdentifier}/sections/{sectionIdentifier}/activities/{activityIdentifier}/execute")
+public class SiriusServerActivityExecutorService implements ISiriusServerService {
+
+    /**
+     * The name of the variable used to capture the name of the project.
+     */
+    private static final Object PROJECT_NAME = "projectName"; //$NON-NLS-1$
+
+    /**
+     * The name of the variable used to capture the identifier of the page.
+     */
+    private static final Object PAGE_IDENTIFIER = "pageIdentifier"; //$NON-NLS-1$
+
+    /**
+     * The name of the variable used to capture the identifier of the section.
+     */
+    private static final Object SECTION_IDENTIFIER = "sectionIdentifier"; //$NON-NLS-1$
+
+    /**
+     * The name of the variable used to capture the identifier of the activity.
+     */
+    private static final Object ACTIVITY_IDENTIFIER = "activityIdentifier"; //$NON-NLS-1$
+
+    @Override
+    public SiriusServerResponse doPost(HttpServletRequest request, Map<String, String> variables, String remainingPart) {
+        String projectName = variables.get(PROJECT_NAME);
+        String pageId = variables.get(PAGE_IDENTIFIER);
+        String sectionId = variables.get(SECTION_IDENTIFIER);
+        String activityId = variables.get(ACTIVITY_IDENTIFIER);
+
+        // @formatter:off
+        Optional<IProject> optionalProject = Optional.ofNullable(ResourcesPlugin.getWorkspace().getRoot().getProject(projectName));
+        Optional<ModelingProject> optionalModelingProject = optionalProject.filter(ModelingProject::hasModelingProjectNature)
+                .filter(IProject::isOpen)
+                .map(iProject -> ModelingProject.asModelingProject(iProject).get()); // FIXME Sirius Optional removal!
+        // @formatter:on
+        if (optionalModelingProject.isPresent()) {
+            ModelingProject modelingProject = optionalModelingProject.get();
+            Session session = SiriusServerUtils.getSession(modelingProject);
+
+            WorkflowHelper.on(session).findActivityById(pageId, sectionId, activityId).ifPresent(activity -> {
+                executeActivity(session, activity);
+            });
+
+            return new SiriusServerResponse(STATUS_OK);
+        }
+
+        return new SiriusServerResponse(STATUS_NOT_FOUND);
+    }
+
+    private void executeActivity(Session session, ActivityDescription activity) {
+        URI taskURI = EcoreUtil.getURI(activity.getOperation());
+        TransactionalEditingDomain ted = session.getTransactionalEditingDomain();
+        ted.getCommandStack().execute(new RecordingCommand(ted) {
+            @Override
+            protected void doExecute() {
+                DAnalysis self = ((DAnalysisSessionImpl) session).getAnalyses().get(0);
+                new SiriusToolServices().executeOperation(self, taskURI.toString());
+            }
+        });
+    }
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerActivityDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerActivityDto.java
new file mode 100644
index 0000000000..d52efe064b
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerActivityDto.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.pages;
+
+/**
+ * The DTO used to represent an activity of the workflow.
+ *
+ * @author sbegaudeau
+ */
+@SuppressWarnings({ "checkstyle::javadocmethod", "checkstyle::javadocfield" })
+public class SiriusServerActivityDto {
+    private String identifier;
+
+    private String name;
+
+    /**
+     * The constructor.
+     * 
+     * @param identifier
+     *            The identifier of the activity
+     * @param name
+     *            The name of the activity
+     */
+    public SiriusServerActivityDto(String identifier, String name) {
+        this.identifier = identifier;
+        this.name = name;
+    }
+
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerPageDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerPageDto.java
new file mode 100644
index 0000000000..cbb4c729dd
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerPageDto.java
@@ -0,0 +1,65 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.pages;
+
+import java.util.List;
+
+/**
+ * The DTO used to receive the details of a page.
+ *
+ * @author sbegaudeau
+ */
+@SuppressWarnings({ "checkstyle::javadocmethod", "checkstyle::javadocfield" })
+public class SiriusServerPageDto {
+    private String identifier;
+
+    private String name;
+
+    private String description;
+
+    private List<SiriusServerSectionDto> sections;
+
+    /**
+     * The constructor.
+     * 
+     * @param identifier
+     *            The identifier
+     * @param name
+     *            The name
+     * @param description
+     *            The description
+     * @param sections
+     *            The sections
+     */
+    public SiriusServerPageDto(String identifier, String name, String description, List<SiriusServerSectionDto> sections) {
+        this.identifier = identifier;
+        this.name = name;
+        this.description = description;
+        this.sections = sections;
+    }
+
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public String getDescription() {
+        return this.description;
+    }
+
+    public List<SiriusServerSectionDto> getSections() {
+        return this.sections;
+    }
+
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerPageService.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerPageService.java
new file mode 100644
index 0000000000..4a64c5a0a8
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerPageService.java
@@ -0,0 +1,96 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.pages;
+
+import static org.eclipse.sirius.server.backend.internal.SiriusServerResponse.STATUS_NOT_FOUND;
+import static org.eclipse.sirius.server.backend.internal.SiriusServerResponse.STATUS_OK;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.sirius.business.api.modelingproject.ModelingProject;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.server.backend.internal.ISiriusServerService;
+import org.eclipse.sirius.server.backend.internal.SiriusServerPath;
+import org.eclipse.sirius.server.backend.internal.SiriusServerResponse;
+import org.eclipse.sirius.server.backend.internal.services.workflow.WorkflowHelper;
+import org.eclipse.sirius.server.backend.internal.utils.SiriusServerUtils;
+
+/**
+ * The service used to manipulate a page of the workflow of a project.
+ *
+ * @author sbegaudeau
+ */
+@SiriusServerPath("/projects/{projectName}/pages/{pageIdentifier}")
+public class SiriusServerPageService implements ISiriusServerService {
+
+    /**
+     * The name of the variable used to capture the name of the project.
+     */
+    private static final Object PROJECT_NAME = "projectName"; //$NON-NLS-1$
+
+    /**
+     * The name of the variable used to capture the identifier of the page.
+     */
+    private static final Object PAGE_IDENTIFIER = "pageIdentifier"; //$NON-NLS-1$
+
+    @Override
+    public SiriusServerResponse doGet(HttpServletRequest request, Map<String, String> variables, String remainingPart) {
+        String projectName = variables.get(PROJECT_NAME);
+        String pageIdentifier = variables.get(PAGE_IDENTIFIER);
+
+        // @formatter:off
+        Optional<IProject> optionalProject = Optional.ofNullable(ResourcesPlugin.getWorkspace().getRoot().getProject(projectName));
+        Optional<ModelingProject> optionalModelingProject = optionalProject.filter(ModelingProject::hasModelingProjectNature)
+                .filter(IProject::isOpen)
+                .map(iProject -> ModelingProject.asModelingProject(iProject).get()); // FIXME Sirius Optional removal!
+        Optional<SiriusServerPageDto> optionalPage = optionalModelingProject.flatMap(modelingProject -> this.getPage(modelingProject, pageIdentifier));
+        // @formatter:on
+        if (optionalPage.isPresent()) {
+            SiriusServerPageDto page = optionalPage.get();
+            return new SiriusServerResponse(STATUS_OK, page);
+        }
+
+        return new SiriusServerResponse(STATUS_NOT_FOUND);
+    }
+
+    /**
+     * Finds the page with the given pageIdentifier in the given modeling
+     * project.
+     *
+     * @param modelingProject
+     *            The modeling project
+     * @param pageIdentifier
+     *            The page identifier
+     * @return An optional containing the page found or an empty optional if it
+     *         does not exist
+     */
+    private Optional<SiriusServerPageDto> getPage(ModelingProject modelingProject, String pageIdentifier) {
+        Session session = SiriusServerUtils.getSession(modelingProject);
+        return WorkflowHelper.on(session).findPageById(pageIdentifier).map(page -> {
+            List<SiriusServerSectionDto> sections = page.getSections().stream().map(section -> {
+                List<SiriusServerActivityDto> activities = section.getActivities().stream().map(desc -> {
+                    return new SiriusServerActivityDto(desc.getName(), desc.getLabelExpression());
+                }).collect(Collectors.toList());
+                return new SiriusServerSectionDto(section.getName(), section.getTitleExpression(), activities);
+
+            }).collect(Collectors.toList());
+            return new SiriusServerPageDto(page.getName(), page.getTitleExpression(), page.getDescriptionExpression(), sections);
+        });
+    }
+
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerSectionDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerSectionDto.java
new file mode 100644
index 0000000000..c8cf5a9513
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/pages/SiriusServerSectionDto.java
@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.pages;
+
+import java.util.List;
+
+/**
+ * The DTO used to represent a section of the workflow page.
+ *
+ * @author sbegaudeau
+ */
+@SuppressWarnings({ "checkstyle::javadocmethod", "checkstyle::javadocfield" })
+public class SiriusServerSectionDto {
+    private String identifier;
+
+    private String name;
+
+    private List<SiriusServerActivityDto> activities;
+
+    /**
+     * The constructor.
+     * 
+     * @param identifier
+     *            The identifier
+     * @param name
+     *            The name
+     * @param activities
+     *            The activities
+     */
+    public SiriusServerSectionDto(String identifier, String name, List<SiriusServerActivityDto> activities) {
+        this.identifier = identifier;
+        this.name = name;
+        this.activities = activities;
+    }
+
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public List<SiriusServerActivityDto> getActivities() {
+        return this.activities;
+    }
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerActivityDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerActivityDto.java
new file mode 100644
index 0000000000..5aa22a7f00
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerActivityDto.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.project;
+
+/**
+ * The DTO used to represent an activity of the workflow.
+ *
+ * @author sbegaudeau
+ */
+@SuppressWarnings({ "checkstyle::javadocmethod", "checkstyle::javadocfield" })
+public class SiriusServerActivityDto {
+    private String identifier;
+
+    private String name;
+
+    /**
+     * The constructor.
+     * 
+     * @param identifier
+     *            The identifier of the activity
+     * @param name
+     *            The name of the activity
+     */
+    public SiriusServerActivityDto(String identifier, String name) {
+        this.identifier = identifier;
+        this.name = name;
+    }
+
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerPageDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerPageDto.java
new file mode 100644
index 0000000000..3253d37ccd
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerPageDto.java
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.project;
+
+/**
+ * The DTO used to represent a page of the workflow.
+ *
+ * @author sbegaudeau
+ */
+@SuppressWarnings({ "checkstyle::javadocmethod", "checkstyle::javadocfield" })
+public class SiriusServerPageDto {
+    private String identifier;
+
+    private String name;
+
+    private String description;
+
+    /**
+     * The constructor.
+     * 
+     * @param identifier
+     *            The identifier
+     * @param name
+     *            The name
+     * @param description
+     *            The description
+     */
+    public SiriusServerPageDto(String identifier, String name, String description) {
+        this.identifier = identifier;
+        this.name = name;
+        this.description = description;
+    }
+
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public String getDescription() {
+        return this.description;
+    }
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectDto.java
index 951efaddfc..0580b7fc01 100644
--- a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectDto.java
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectDto.java
@@ -25,6 +25,10 @@ public class SiriusServerProjectDto {
 
     private List<SiriusServerSemanticResourceDto> semanticResources;
 
+    private List<SiriusServerPageDto> pages;
+
+    private List<SiriusServerSectionDto> currentPageSections;
+
     /**
      * The constructor.
      *
@@ -34,11 +38,18 @@ public class SiriusServerProjectDto {
      *            The representations
      * @param semanticResources
      *            The semantic resources
+     * @param pages
+     *            The pages of the workflow
+     * @param currentPageSections
+     *            The sections of the current page of the workflow
      */
-    public SiriusServerProjectDto(String name, List<AbstractSiriusServerRepresentationDto> representations, List<SiriusServerSemanticResourceDto> semanticResources) {
+    public SiriusServerProjectDto(String name, List<AbstractSiriusServerRepresentationDto> representations, List<SiriusServerSemanticResourceDto> semanticResources, List<SiriusServerPageDto> pages,
+            List<SiriusServerSectionDto> currentPageSections) {
         this.name = name;
         this.representations = representations;
         this.semanticResources = semanticResources;
+        this.pages = pages;
+        this.currentPageSections = currentPageSections;
     }
 
     public String getName() {
@@ -53,4 +64,12 @@ public class SiriusServerProjectDto {
         return this.semanticResources;
     }
 
+    public List<SiriusServerPageDto> getPages() {
+        return this.pages;
+    }
+
+    public List<SiriusServerSectionDto> getCurrentPageSections() {
+        return this.currentPageSections;
+    }
+
 }
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectService.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectService.java
index 041a948f3e..5df8de86d9 100644
--- a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectService.java
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerProjectService.java
@@ -17,6 +17,7 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.text.DecimalFormat;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -41,12 +42,14 @@ import org.eclipse.sirius.server.backend.internal.ISiriusServerService;
 import org.eclipse.sirius.server.backend.internal.SiriusServerBackendPlugin;
 import org.eclipse.sirius.server.backend.internal.SiriusServerPath;
 import org.eclipse.sirius.server.backend.internal.SiriusServerResponse;
+import org.eclipse.sirius.server.backend.internal.services.workflow.WorkflowHelper;
 import org.eclipse.sirius.server.backend.internal.utils.SiriusServerUtils;
 import org.eclipse.sirius.table.metamodel.table.description.TableDescription;
 import org.eclipse.sirius.tree.description.TreeDescription;
 import org.eclipse.sirius.viewpoint.DRepresentationDescriptor;
 import org.eclipse.sirius.viewpoint.description.RepresentationDescription;
 import org.eclipse.sirius.viewpoint.description.Viewpoint;
+import org.eclipse.sirius.workflow.SectionDescription;
 
 /**
  * Service used to manipulate a specific project.
@@ -101,7 +104,42 @@ public class SiriusServerProjectService implements ISiriusServerService {
         String projectName = modelingProject.getProject().getName();
         List<AbstractSiriusServerRepresentationDto> representations = this.getRepresentations(session);
         List<SiriusServerSemanticResourceDto> semanticResources = this.getSemanticResources(modelingProject.getProject(), session);
-        return new SiriusServerProjectDto(projectName, representations, semanticResources);
+        List<SiriusServerPageDto> pages = this.getPages(session);
+        List<SiriusServerSectionDto> currentPageSections = this.getFirstPageSections(session);
+        return new SiriusServerProjectDto(projectName, representations, semanticResources, pages, currentPageSections);
+    }
+
+    /**
+     * Returns the list of workflow page from the given session.
+     *
+     * @param session
+     *            The session
+     * @return The list of workflow page from the given session
+     */
+    private List<SiriusServerPageDto> getPages(Session session) {
+        return WorkflowHelper.on(session).getPageDescriptions().map(page -> {
+            return new SiriusServerPageDto(page.getName(), page.getLabel(), page.getDescriptionExpression());
+        }).collect(Collectors.toList());
+    }
+
+    /**
+     * Returns the list of the sections of the current page.
+     *
+     * @param session
+     *            The session
+     * @return The list of the sections of the current page
+     */
+    private List<SiriusServerSectionDto> getFirstPageSections(Session session) {
+        List<SiriusServerSectionDto> sections = new ArrayList<>();
+        WorkflowHelper.on(session).getPageDescriptions().findFirst().ifPresent(page -> {
+            for (SectionDescription sectionDesc : page.getSections()) {
+                List<SiriusServerActivityDto> activities = sectionDesc.getActivities().stream().map(desc -> {
+                    return new SiriusServerActivityDto(desc.getName(), desc.getLabelExpression());
+                }).collect(Collectors.toList());
+                sections.add(new SiriusServerSectionDto(sectionDesc.getName(), sectionDesc.getTitleExpression(), activities));
+            }
+        });
+        return sections;
     }
 
     /**
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerSectionDto.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerSectionDto.java
new file mode 100644
index 0000000000..136ba70a17
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/project/SiriusServerSectionDto.java
@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.project;
+
+import java.util.List;
+
+/**
+ * The DTO used to represent a section of the workflow page.
+ *
+ * @author sbegaudeau
+ */
+@SuppressWarnings({ "checkstyle::javadocmethod", "checkstyle::javadocfield" })
+public class SiriusServerSectionDto {
+    private String identifier;
+
+    private String name;
+
+    private List<SiriusServerActivityDto> activities;
+
+    /**
+     * The constructor.
+     * 
+     * @param identifier
+     *            The identifier
+     * @param name
+     *            The name
+     * @param activities
+     *            The activities
+     */
+    public SiriusServerSectionDto(String identifier, String name, List<SiriusServerActivityDto> activities) {
+        this.identifier = identifier;
+        this.name = name;
+        this.activities = activities;
+    }
+
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public List<SiriusServerActivityDto> getActivities() {
+        return this.activities;
+    }
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/workflow/SiriusToolServices.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/workflow/SiriusToolServices.java
new file mode 100644
index 0000000000..9ea8da025d
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/workflow/SiriusToolServices.java
@@ -0,0 +1,127 @@
+/*******************************************************************************
+ * Copyright (c) 2015, 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.workflow;
+
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.eclipse.core.runtime.OperationCanceledException;
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.resource.Resource;
+import org.eclipse.sirius.business.api.helper.task.ICommandTask;
+import org.eclipse.sirius.business.api.helper.task.TaskHelper;
+import org.eclipse.sirius.business.api.query.EObjectQuery;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.ecore.extender.business.api.accessor.ModelAccessor;
+import org.eclipse.sirius.tools.api.command.SiriusCommand;
+import org.eclipse.sirius.viewpoint.SiriusPlugin;
+import org.eclipse.sirius.viewpoint.description.Viewpoint;
+import org.eclipse.sirius.viewpoint.description.tool.InitialOperation;
+import org.eclipse.sirius.viewpoint.description.tool.ModelOperation;
+
+/**
+ * This class contains various services provided by the Sirius UI Properties
+ * bundle to the interpreter.
+ *
+ * @author sbegaudeau
+ */
+public class SiriusToolServices {
+
+    /**
+     * Executes the operation with the given URI.
+     *
+     * @param eObject
+     *            The EObject to use as the operation's context
+     * @param initialCommandUri
+     *            the URI of the operation to execute
+     * @return the model element on which the tool was executed.
+     */
+    public EObject executeOperation(EObject eObject, String initialCommandUri) {
+        if (!eObject.eIsProxy()) {
+            Session session = new EObjectQuery(eObject).getSession();
+            if (session != null) {
+                ModelOperation modelOperation = findModelOperation(initialCommandUri, session);
+                if (modelOperation != null) {
+                    ModelAccessor modelAccessor = session.getModelAccessor();
+                    ICommandTask task = new TaskHelper(modelAccessor, SiriusPlugin.getDefault().getUiCallback()).buildTaskFromModelOperation(eObject, modelOperation);
+                    SiriusCommand command = new SiriusCommand(session.getTransactionalEditingDomain(), "SiriusToolServices#executeOperation"); //$NON-NLS-1$
+                    command.getTasks().add(task);
+                    try {
+                        if (command.canExecute()) {
+                            command.execute();
+                        }
+                    } catch (OperationCanceledException cancel) {
+                        // A tool (possibly via a Java service) can request the
+                        // cancellation of its execution. This is
+                        // handled as a rollback by EMF Transaction, but the
+                        // exception should not propagate above this
+                        // point: it's a signal for requesting
+                        // cancellation/rollback, which at this point is done,
+                        // but
+                        // not an error that the caller should be aware of.
+                    } finally {
+                        command.dispose();
+                    }
+                }
+            }
+        }
+        return eObject;
+    }
+
+    /**
+     * Resolves the actual {@link ModelOperation} to execute given its URI.
+     *
+     * @param initialCommandUri
+     *            the URI of the operation to search for.
+     * @param session
+     *            the Sirius session which determines the scope to search into.
+     * @return the {@link ModelOperation} instance found at the specified URI,
+     *         either in one of the VSMs for which at least one Viewpoint is
+     *         currently enabled in the session, or from the default ruleset, or
+     *         <code>null</code> if no matching operation could be located.
+     */
+    private ModelOperation findModelOperation(String initialCommandUri, Session session) {
+        URI commandResourceURI = URI.createURI(initialCommandUri).trimFragment();
+        for (Resource res : getResourcesInScope(session)) {
+            if (commandResourceURI.equals(res.getURI())) {
+                EObject modelOperationEObject = res.getEObject(URI.createURI(initialCommandUri).fragment());
+                if (modelOperationEObject instanceof InitialOperation) {
+                    return ((InitialOperation) modelOperationEObject).getFirstModelOperations();
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Returns all the (VSM-like) resources in which to search for the
+     * {@link ModelOperation} to execute.
+     *
+     * @param session
+     *            the Sirius session.
+     * @return all the resources in which to look for the ModelOperation, in
+     *         order of preference.
+     */
+    private Set<Resource> getResourcesInScope(Session session) {
+        Set<Resource> result = new LinkedHashSet<>();
+        Collection<Viewpoint> selectedViewpoints = session.getSelectedViewpoints(true);
+        for (Viewpoint viewpoint : selectedViewpoints) {
+            Resource eResource = viewpoint.eResource();
+            if (eResource != null) {
+                result.add(eResource);
+            }
+        }
+        return result;
+    }
+
+}
diff --git a/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/workflow/WorkflowHelper.java b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/workflow/WorkflowHelper.java
new file mode 100644
index 0000000000..ebfaca849f
--- /dev/null
+++ b/plugins/org.eclipse.sirius.server.backend/src/org/eclipse/sirius/server/backend/internal/services/workflow/WorkflowHelper.java
@@ -0,0 +1,97 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.server.backend.internal.services.workflow;
+
+import java.util.Collection;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+import org.eclipse.sirius.business.api.query.EObjectQuery;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.ext.base.Option;
+import org.eclipse.sirius.viewpoint.description.DescriptionPackage;
+import org.eclipse.sirius.viewpoint.description.Group;
+import org.eclipse.sirius.viewpoint.description.IdentifiedElement;
+import org.eclipse.sirius.workflow.ActivityDescription;
+import org.eclipse.sirius.workflow.PageDescription;
+import org.eclipse.sirius.workflow.SectionDescription;
+import org.eclipse.sirius.workflow.WorkflowDescription;
+
+/**
+ * Utility methods to manipulate Workflows and their elements.
+ *
+ * @author pcdavid
+ *
+ */
+// CHECKSTYLE:OFF
+public final class WorkflowHelper {
+    private final Session session;
+
+    public static WorkflowHelper on(Session session) {
+        return new WorkflowHelper(Objects.requireNonNull(session));
+    }
+
+    private WorkflowHelper(Session session) {
+        this.session = session;
+    }
+
+    /**
+     * Finds all the workflow pages that apply to the given session. This may
+     * include pages defined in different workflows, but pages that originate
+     * from a given workflow are guaranteed to be contiguous.
+     *
+     * @return all the workflow pages that apply to the session.
+     */
+    public Stream<PageDescription> getPageDescriptions() {
+        return getWorkflowDescriptions().flatMap(w -> w.getPages().stream());
+    }
+
+    /**
+     * Returns the workflow descriptions from the given session.
+     *
+     * @return The workflow descriptions from the given session
+     */
+    public Stream<WorkflowDescription> getWorkflowDescriptions() {
+        // @formatter:off
+        return session.getSelectedViewpoints(true).stream()
+                .map(viewpoint -> new EObjectQuery(viewpoint).getFirstAncestorOfType(DescriptionPackage.Literals.GROUP))
+                .filter(Option::some)
+                .map(Option::get)
+                .filter(Group.class::isInstance)
+                .map(Group.class::cast)
+                .flatMap(group -> group.getExtensions().stream())
+                .filter(WorkflowDescription.class::isInstance)
+                .map(WorkflowDescription.class::cast);
+        // @formatter:on
+    }
+
+    public Optional<PageDescription> findPageById(String pageIdentifier) {
+        return findById(getPageDescriptions(), pageIdentifier);
+    }
+
+    public Optional<SectionDescription> findSectionById(String pageId, String sectionId) {
+        return findPageById(pageId).flatMap(page -> findById(page.getSections(), sectionId));
+    }
+
+    public Optional<ActivityDescription> findActivityById(String pageId, String sectionId, String activityId) {
+        return findSectionById(pageId, sectionId).flatMap(section -> findById(section.getActivities(), activityId));
+    }
+
+    private <T extends IdentifiedElement> Optional<T> findById(Collection<T> candidates, String id) {
+        return findById(candidates.stream(), id);
+    }
+
+    private <T extends IdentifiedElement> Optional<T> findById(Stream<T> candidates, String id) {
+        return candidates.filter(elt -> Objects.equals(elt.getName(), id)).findFirst();
+    }
+
+}
diff --git a/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerManager.java b/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerManager.java
index 655966dfa0..b4ab5a4d85 100644
--- a/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerManager.java
+++ b/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerManager.java
@@ -44,6 +44,8 @@ public class SiriusServerManager {
      */
     private Server server;
 
+    private InetSocketAddress address;
+
     /**
      * Starts the HTTP server.
      */
@@ -51,7 +53,7 @@ public class SiriusServerManager {
     public void start() {
         if (this.server == null || !this.server.isRunning()) {
             int port = Integer.valueOf(System.getProperty(PORT_VMARG, PORT)).intValue();
-            InetSocketAddress address = new InetSocketAddress(HOSTNAME, port);
+            address = new InetSocketAddress(HOSTNAME, port);
             this.server = new Server(address);
             this.server.setHandler(new HandlerCollection());
 
@@ -80,4 +82,13 @@ public class SiriusServerManager {
             }
         });
     }
+
+    /**
+     * Returns the address on which the server is listening.
+     * 
+     * @return the address on which the server is listening.
+     */
+    public InetSocketAddress getAddress() {
+        return this.address;
+    }
 }
diff --git a/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerPlugin.java b/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerPlugin.java
index bb16c84fcb..cb74c8d996 100644
--- a/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerPlugin.java
+++ b/plugins/org.eclipse.sirius.server/src/org/eclipse/sirius/server/internal/SiriusServerPlugin.java
@@ -10,6 +10,7 @@
  *******************************************************************************/
 package org.eclipse.sirius.server.internal;
 
+import java.net.InetSocketAddress;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -140,7 +141,7 @@ public class SiriusServerPlugin extends EMFPlugin {
 
         /**
          * Returns the list of the {@link ISiriusServerConfigurator}.
-         * 
+         *
          * @return The list of the {@link ISiriusServerConfigurator}
          */
         public List<ISiriusServerConfigurator> getSiriusServerConfigurators() {
@@ -150,5 +151,14 @@ public class SiriusServerPlugin extends EMFPlugin {
 					.collect(Collectors.toList());
 			// @formatter:on
         }
+
+        /**
+         * Returns the address on which the server is listening.
+         * 
+         * @return the address on which the server is listening.
+         */
+        public InetSocketAddress getServerAddress() {
+            return serverManager.getAddress();
+        }
     }
 }
diff --git a/plugins/org.eclipse.sirius.workflow.services/.checkstyle b/plugins/org.eclipse.sirius.workflow.services/.checkstyle
new file mode 100644
index 0000000000..3c756ff819
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.checkstyle
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<fileset-config file-format-version="1.2.0" simple-config="true" sync-formatter="false">
+  <local-check-config name="Sirius Checks" location="/org.eclipse.sirius.settings/CheckstyleConfiguration.xml" type="project" description="">
+    <additional-data name="protect-config-file" value="false"/>
+  </local-check-config>
+  <fileset name="all" enabled="true" check-config-name="Sirius Checks" local="true">
+    <file-match-pattern match-pattern="." include-pattern="true"/>
+  </fileset>
+  <filter name="FilesFromPackage" enabled="true">
+    <filter-data value="src-gen"/>
+  </filter>
+</fileset-config>
diff --git a/plugins/org.eclipse.sirius.workflow.services/.classpath b/plugins/org.eclipse.sirius.workflow.services/.classpath
new file mode 100644
index 0000000000..eca7bdba8f
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/plugins/org.eclipse.sirius.workflow.services/.project b/plugins/org.eclipse.sirius.workflow.services/.project
new file mode 100644
index 0000000000..5f6b389345
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.project
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.eclipse.sirius.workflow.services</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/fr.obeo.baseliner.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/fr.obeo.baseliner.prefs
new file mode 100644
index 0000000000..edbf92725a
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/fr.obeo.baseliner.prefs
@@ -0,0 +1,2 @@
+baselineSource=platform\:/resource/org.eclipse.sirius.targets/baseline.target
+eclipse.preferences.version=1
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.core.resources.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000000..9093a2c880
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,4 @@
+#Thu Jan 26 14:35:58 CET 2012
+eclipse.preferences.version=1
+encoding/<project>=US-ASCII
+encoding/analysis_templates=ISO-8859-1
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.core.runtime.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.core.runtime.prefs
new file mode 100644
index 0000000000..a287fefdba
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.core.runtime.prefs
@@ -0,0 +1,3 @@
+#Mon Sep 24 15:04:19 CEST 2007
+eclipse.preferences.version=1
+line.separator=\n
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.jdt.core.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000000..97c066b909
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,354 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.annotationSuperInterface=warning
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.autoboxing=ignore
+org.eclipse.jdt.core.compiler.problem.deprecation=warning
+org.eclipse.jdt.core.compiler.problem.deprecationInDeprecatedCode=disabled
+org.eclipse.jdt.core.compiler.problem.deprecationWhenOverridingDeprecatedMethod=disabled
+org.eclipse.jdt.core.compiler.problem.discouragedReference=warning
+org.eclipse.jdt.core.compiler.problem.emptyStatement=ignore
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.fallthroughCase=ignore
+org.eclipse.jdt.core.compiler.problem.fatalOptionalError=enabled
+org.eclipse.jdt.core.compiler.problem.fieldHiding=ignore
+org.eclipse.jdt.core.compiler.problem.finalParameterBound=warning
+org.eclipse.jdt.core.compiler.problem.finallyBlockNotCompletingNormally=warning
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=error
+org.eclipse.jdt.core.compiler.problem.hiddenCatchBlock=warning
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+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_annotation_type_member_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_catch=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_constructor_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_enum_constant=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_for=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_if=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_invocation=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_parenthesized_expression=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_synchronized=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_try=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_while=insert
+org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_return=insert
+org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_throw=insert
+org.eclipse.jdt.core.formatter.insert_space_before_postfix_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_prefix_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_question_in_conditional=insert
+org.eclipse.jdt.core.formatter.insert_space_before_question_in_wildcard=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_for=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_try_resources=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_unary_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_brackets_in_array_type_reference=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_braces_in_array_initializer=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_brackets_in_array_allocation_expression=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_constructor_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation=do not insert
+org.eclipse.jdt.core.formatter.join_lines_in_comments=true
+org.eclipse.jdt.core.formatter.join_wrapped_lines=true
+org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.keep_empty_array_initializer_on_one_line=false
+org.eclipse.jdt.core.formatter.keep_imple_if_on_one_line=false
+org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.lineSplit=200
+org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body=0
+org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve=1
+org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line=false
+org.eclipse.jdt.core.formatter.tabulation.char=space
+org.eclipse.jdt.core.formatter.tabulation.size=4
+org.eclipse.jdt.core.formatter.use_on_off_tags=true
+org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
+org.eclipse.jdt.core.formatter.wrap_before_binary_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_or_operator_multicatch=true
+org.eclipse.jdt.core.formatter.wrap_outer_expressions_when_nested=true
+org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=disabled
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.jdt.ui.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.jdt.ui.prefs
new file mode 100644
index 0000000000..f903dbceb5
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.jdt.ui.prefs
@@ -0,0 +1,62 @@
+cleanup.add_default_serial_version_id=true
+cleanup.add_generated_serial_version_id=false
+cleanup.add_missing_annotations=true
+cleanup.add_missing_deprecated_annotations=true
+cleanup.add_missing_methods=false
+cleanup.add_missing_nls_tags=false
+cleanup.add_missing_override_annotations=true
+cleanup.add_missing_override_annotations_interface_methods=true
+cleanup.add_serial_version_id=true
+cleanup.always_use_blocks=true
+cleanup.always_use_parentheses_in_expressions=false
+cleanup.always_use_this_for_non_static_field_access=false
+cleanup.always_use_this_for_non_static_method_access=false
+cleanup.convert_to_enhanced_for_loop=true
+cleanup.correct_indentation=true
+cleanup.format_source_code=true
+cleanup.format_source_code_changes_only=false
+cleanup.make_local_variable_final=true
+cleanup.make_parameters_final=false
+cleanup.make_private_fields_final=true
+cleanup.make_type_abstract_if_missing_method=false
+cleanup.make_variable_declarations_final=false
+cleanup.never_use_blocks=false
+cleanup.never_use_parentheses_in_expressions=true
+cleanup.organize_imports=true
+cleanup.qualify_static_field_accesses_with_declaring_class=true
+cleanup.qualify_static_member_accesses_through_instances_with_declaring_class=true
+cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=true
+cleanup.qualify_static_member_accesses_with_declaring_class=true
+cleanup.qualify_static_method_accesses_with_declaring_class=true
+cleanup.remove_private_constructors=true
+cleanup.remove_trailing_whitespaces=true
+cleanup.remove_trailing_whitespaces_all=true
+cleanup.remove_trailing_whitespaces_ignore_empty=false
+cleanup.remove_unnecessary_casts=true
+cleanup.remove_unnecessary_nls_tags=true
+cleanup.remove_unused_imports=true
+cleanup.remove_unused_local_variables=false
+cleanup.remove_unused_private_fields=true
+cleanup.remove_unused_private_members=false
+cleanup.remove_unused_private_methods=true
+cleanup.remove_unused_private_types=true
+cleanup.sort_members=false
+cleanup.sort_members_all=false
+cleanup.use_blocks=true
+cleanup.use_blocks_only_for_return_and_throw=false
+cleanup.use_parentheses_in_expressions=false
+cleanup.use_this_for_non_static_field_access=false
+cleanup.use_this_for_non_static_field_access_only_if_necessary=true
+cleanup.use_this_for_non_static_method_access=false
+cleanup.use_this_for_non_static_method_access_only_if_necessary=true
+cleanup_profile=_Sirius
+cleanup_settings_version=2
+eclipse.preferences.version=1
+formatter_profile=_Sirius
+formatter_settings_version=12
+org.eclipse.jdt.ui.ignorelowercasenames=true
+org.eclipse.jdt.ui.importorder=java;javax;org;com;
+org.eclipse.jdt.ui.javadoc=false
+org.eclipse.jdt.ui.ondemandthreshold=99
+org.eclipse.jdt.ui.staticondemandthreshold=99
+org.eclipse.jdt.ui.text.custom_code_templates=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?><templates><template autoinsert\="true" context\="gettercomment_context" deleted\="false" description\="Comment for getter method" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.gettercomment" name\="gettercomment">/**\n * @return the ${bare_field_name}\n */</template><template autoinsert\="true" context\="settercomment_context" deleted\="false" description\="Comment for setter method" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.settercomment" name\="settercomment">/**\n * @param ${param} the ${bare_field_name} to set\n */</template><template autoinsert\="true" context\="constructorcomment_context" deleted\="false" description\="Comment for created constructors" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.constructorcomment" name\="constructorcomment">/**\n * ${tags}\n */</template><template autoinsert\="true" context\="filecomment_context" deleted\="false" description\="Comment for created Java files" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.filecomment" name\="filecomment">/**\n * \n */</template><template autoinsert\="true" context\="typecomment_context" deleted\="false" description\="Comment for created types" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.typecomment" name\="typecomment">/**\n * @author ${user}\n *\n * ${tags}\n */</template><template autoinsert\="true" context\="fieldcomment_context" deleted\="false" description\="Comment for fields" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.fieldcomment" name\="fieldcomment">/**\n * \n */</template><template autoinsert\="true" context\="methodcomment_context" deleted\="false" description\="Comment for non-overriding methods" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.methodcomment" name\="methodcomment">/**\n * ${tags}\n */</template><template autoinsert\="true" context\="overridecomment_context" deleted\="false" description\="Comment for overriding methods" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.overridecomment" name\="overridecomment">/* (non-Javadoc)\n * ${see_to_overridden}\n */</template><template autoinsert\="true" context\="delegatecomment_context" deleted\="false" description\="Comment for delegate methods" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.delegatecomment" name\="delegatecomment">/**\n * ${tags}\n * ${see_to_target}\n */</template><template autoinsert\="true" context\="newtype_context" deleted\="false" description\="Newly created files" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.newtype" name\="newtype">${filecomment}\n${package_declaration}\n\n${typecomment}\n${type_declaration}</template><template autoinsert\="true" context\="classbody_context" deleted\="false" description\="Code in new class type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.classbody" name\="classbody">\n</template><template autoinsert\="true" context\="interfacebody_context" deleted\="false" description\="Code in new interface type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.interfacebody" name\="interfacebody">\n</template><template autoinsert\="true" context\="enumbody_context" deleted\="false" description\="Code in new enum type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.enumbody" name\="enumbody">\n</template><template autoinsert\="true" context\="annotationbody_context" deleted\="false" description\="Code in new annotation type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.annotationbody" name\="annotationbody">\n</template><template autoinsert\="true" context\="catchblock_context" deleted\="false" description\="Code in new catch blocks" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.catchblock" name\="catchblock">// ${todo} Auto-generated catch block\n${exception_var}.printStackTrace();</template><template autoinsert\="true" context\="methodbody_context" deleted\="false" description\="Code in created method stubs" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.methodbody" name\="methodbody">// ${todo} Auto-generated method stub\n${body_statement}</template><template autoinsert\="true" context\="constructorbody_context" deleted\="false" description\="Code in created constructor stubs" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.constructorbody" name\="constructorbody">${body_statement}\n// ${todo} Auto-generated constructor stub</template><template autoinsert\="true" context\="getterbody_context" deleted\="false" description\="Code in created getters" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.getterbody" name\="getterbody">return ${field};</template><template autoinsert\="true" context\="setterbody_context" deleted\="false" description\="Code in created setters" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.setterbody" name\="setterbody">${field} \= ${param};</template></templates>
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.ltk.core.refactoring.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.ltk.core.refactoring.prefs
new file mode 100644
index 0000000000..b196c64a34
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.ltk.core.refactoring.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+org.eclipse.ltk.core.refactoring.enable.project.refactoring.history=false
diff --git a/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.pde.prefs b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.pde.prefs
new file mode 100644
index 0000000000..c307a7b58e
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/.settings/org.eclipse.pde.prefs
@@ -0,0 +1,32 @@
+compilers.f.unresolved-features=1
+compilers.f.unresolved-plugins=1
+compilers.incompatible-environment=0
+compilers.p.build=0
+compilers.p.build.bin.includes=0
+compilers.p.build.encodings=0
+compilers.p.build.java.compiler=0
+compilers.p.build.java.compliance=0
+compilers.p.build.missing.output=0
+compilers.p.build.output.library=0
+compilers.p.build.source.library=0
+compilers.p.build.src.includes=0
+compilers.p.deprecated=1
+compilers.p.discouraged-class=1
+compilers.p.internal=0
+compilers.p.missing-packages=0
+compilers.p.missing-version-export-package=1
+compilers.p.missing-version-import-package=1
+compilers.p.missing-version-require-bundle=0
+compilers.p.no-required-att=0
+compilers.p.not-externalized-att=0
+compilers.p.unknown-attribute=1
+compilers.p.unknown-class=1
+compilers.p.unknown-element=1
+compilers.p.unknown-identifier=0
+compilers.p.unknown-resource=0
+compilers.p.unresolved-ex-points=0
+compilers.p.unresolved-import=0
+compilers.s.create-docs=false
+compilers.s.doc-folder=doc
+compilers.s.open-tags=1
+eclipse.preferences.version=1
diff --git a/plugins/org.eclipse.sirius.workflow.services/META-INF/MANIFEST.MF b/plugins/org.eclipse.sirius.workflow.services/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000..6064c49c80
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/META-INF/MANIFEST.MF
@@ -0,0 +1,26 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: %pluginName
+Bundle-Vendor: %providerName
+Bundle-SymbolicName: org.eclipse.sirius.workflow.services;singleton:=true
+Bundle-Version: 6.0.0.qualifier
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
+Bundle-ActivationPolicy: lazy
+Bundle-Localization: plugin
+Export-Package: org.eclipse.sirius.workflow.services.api;version="6.0.0",
+ org.eclipse.sirius.workflow.services.api.representations;version="6.0.0",
+ org.eclipse.sirius.workflow.services.api.sessions;version="6.0.0",
+ org.eclipse.sirius.workflow.services.api.workflow;version="6.0.0",
+ org.eclipse.sirius.workflow.services.internal.representations;x-internal:=true,
+ org.eclipse.sirius.workflow.services.internal.sessions;x-internal:=true,
+ org.eclipse.sirius.workflow.services.internal.workflow;x-internal:=true
+Require-Bundle: org.eclipse.sirius;bundle-version="6.0.0",
+ org.eclipse.sirius.ui;bundle-version="6.0.0",
+ org.eclipse.swt;bundle-version="3.0.0",
+ org.eclipse.ui.ide;bundle-version="3.8.0",
+ org.eclipse.jface;bundle-version="3.8.0",
+ org.eclipse.core.runtime;bundle-version="3.8.0",
+ org.eclipse.emf.transaction;bundle-version="1.5.0",
+ org.eclipse.sirius.ext.base;bundle-version="6.0.0",
+ org.eclipse.sirius.common;bundle-version="6.0.0",
+ org.eclipse.sirius.workflow.model;bundle-version="6.0.0"
diff --git a/plugins/org.eclipse.sirius.workflow.services/about.html b/plugins/org.eclipse.sirius.workflow.services/about.html
new file mode 100644
index 0000000000..420ad0f930
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/about.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<!-- saved from url=(0043)http://www.eclipse.org/legal/epl/about.html -->
+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+
+<title>About</title>
+</head>
+<body lang="EN-US">
+<h2>About This Content</h2>
+ 
+<p>June 5, 2006</p>	
+<h3>License</h3>
+
+<p>The Eclipse Foundation makes available all content in this plug-in ("Content").  Unless otherwise 
+indicated below, the Content is provided to you under the terms and conditions of the
+Eclipse Public License Version 1.0 ("EPL").  A copy of the EPL is available 
+at <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>.
+For purposes of the EPL, "Program" will mean the Content.</p>
+
+<p>If you did not receive this Content directly from the Eclipse Foundation, the Content is 
+being redistributed by another party ("Redistributor") and different terms and conditions may
+apply to your use of any object code in the Content.  Check the Redistributor's license that was 
+provided with the Content.  If no such license exists, contact the Redistributor.  Unless otherwise
+indicated below, the terms and conditions of the EPL still apply to any source code in the Content
+and such source code may be obtained at <a href="http://www.eclipse.org/">http://www.eclipse.org</a>.</p>
+
+
+</body></html>
\ No newline at end of file
diff --git a/plugins/org.eclipse.sirius.workflow.services/build.properties b/plugins/org.eclipse.sirius.workflow.services/build.properties
new file mode 100644
index 0000000000..c4bc17ca84
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/build.properties
@@ -0,0 +1,20 @@
+#  Copyright (c) 2018 Obeo.
+#  All rights reserved. This program and the accompanying materials
+#  are made available under the terms of the Eclipse Public License v2.0
+#  which accompanies this distribution, and is available at
+#  https://www.eclipse.org/legal/epl-2.0/
+# 
+#  Contributors:
+#     Obeo - initial API and implementation
+# 
+
+bin.includes = .,\
+               META-INF/,\
+               plugin.properties,\
+               about.html
+jars.compile.order = .
+source.. = src/
+output.. = bin/
+javacWarnings.. = none
+javacDefaultEncoding.. = US-ASCII
+javacProjectSettings = true
diff --git a/plugins/org.eclipse.sirius.workflow.services/plugin.properties b/plugins/org.eclipse.sirius.workflow.services/plugin.properties
new file mode 100644
index 0000000000..294ec2ec49
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/plugin.properties
@@ -0,0 +1,16 @@
+# ====================================================================
+# Copyright (c) 2018 Obeo
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+#
+# Contributors:
+#    Obeo - initial API and implementation
+# ====================================================================
+
+pluginName = Workflow Page Provider for Aird Editor
+providerName = Eclipse Modeling Project
+
+WorkflowPage_tab_name=Workflow
+WorkflowPage_header_title=Workflow of {0}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/SiriusServicesUtils.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/SiriusServicesUtils.java
new file mode 100644
index 0000000000..c59dcfeab0
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/SiriusServicesUtils.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api;
+
+import java.util.Base64;
+
+/**
+ * Utility class used to manipulate Sirius concepts.
+ *
+ * @author sbegaudeau
+ */
+public class SiriusServicesUtils {
+	/**
+	 * Encodes the given string.
+	 *
+	 * @param string
+	 *            The string to encode
+	 * @return The encoded version of the given string
+	 */
+	public static String encode(String string) {
+		return new String(Base64.getEncoder().encode(string.getBytes()));
+	}
+
+	/**
+	 * Decodes the given string.
+	 * 
+	 * @param string
+	 *            The string to decode
+	 * @return The decoded version of the given string
+	 */
+	public static String decode(String string) {
+		return new String(Base64.getDecoder().decode(string));
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/CreateRepresentationDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/CreateRepresentationDto.java
new file mode 100644
index 0000000000..c896930b99
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/CreateRepresentationDto.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.representations;
+
+/**
+ * The command used to create a new representation.
+ *
+ * @author sbegaudeau
+ */
+public class CreateRepresentationDto {
+	/**
+	 * The identifier of the representation.
+	 */
+	private String representationId;
+
+	/**
+	 * Return the representationId.
+	 *
+	 * @return the representationId
+	 */
+	public String getRepresentationId() {
+		return this.representationId;
+	}
+
+	/**
+	 * Sets the representationId.
+	 *
+	 * @param representationId
+	 *            the representationId to set
+	 */
+	public void setRepresentationId(String representationId) {
+		this.representationId = representationId;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/ISiriusRepresentationService.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/ISiriusRepresentationService.java
new file mode 100644
index 0000000000..facf99af20
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/ISiriusRepresentationService.java
@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.representations;
+
+import java.util.Optional;
+
+/**
+ * The services used to manipulate Sirius sessions.
+ *
+ * @author sbegaudeau
+ */
+public interface ISiriusRepresentationService {
+	/**
+	 * Returns the representations of the session with the given session identifier.
+	 * 
+	 * @param sessionId
+	 *            The session identifier
+	 * @return The representations of the session with the given session identifier
+	 */
+	RepresentationsDto getRepresentations(String sessionId);
+
+	/**
+	 * Creates a new representation in the session with the given sessionId.
+	 *
+	 * @param sessionId
+	 *            The identifier of the session
+	 * @param createRepresentationDto
+	 *            The details of the representation to create
+	 * @return An optional with the representation created or an empty optional if it could not be created
+	 */
+	Optional<RepresentationDto> createRepresentation(String sessionId, CreateRepresentationDto createRepresentationDto);
+
+	/**
+	 * Opens a representation in the session with the given sessionId.
+	 *
+	 * @param sessionId
+	 *            The identifier of the session
+	 * @param openRepresentationDto
+	 *            The details of the representation to open
+	 * @return An optional with the representation opened or an empty optional if it could not be opened
+	 */
+	Optional<RepresentationDto> openRepresentation(String sessionId, OpenRepresentationDto openRepresentationDto);
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/OpenRepresentationDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/OpenRepresentationDto.java
new file mode 100644
index 0000000000..1c6cfdd2a1
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/OpenRepresentationDto.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.representations;
+
+/**
+ * The command used to open e representation.
+ *
+ * @author sbegaudeau
+ */
+public class OpenRepresentationDto {
+	/**
+	 * The identifier of the representation.
+	 */
+	private String representationId;
+
+	/**
+	 * Return the representationId.
+	 *
+	 * @return the representationId
+	 */
+	public String getRepresentationId() {
+		return this.representationId;
+	}
+
+	/**
+	 * Sets the representationId.
+	 *
+	 * @param representationId
+	 *            the representationId to set
+	 */
+	public void setRepresentationId(String representationId) {
+		this.representationId = representationId;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/RepresentationDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/RepresentationDto.java
new file mode 100644
index 0000000000..ca207a40ad
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/RepresentationDto.java
@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.representations;
+
+/**
+ * A representation DTO.
+ *
+ * @author sbegaudeau
+ */
+public class RepresentationDto {
+	/**
+	 * The identifier.
+	 */
+	private String representationId;
+
+	/**
+	 * The label.
+	 */
+	private String label;
+
+	/**
+	 * The constructor.
+	 * 
+	 * @param representationId
+	 *            The identifier
+	 * @param label
+	 *            The label
+	 */
+	public RepresentationDto(String representationId, String label) {
+		this.representationId = representationId;
+		this.label = label;
+	}
+
+	/**
+	 * Return the representationId.
+	 *
+	 * @return the representationId
+	 */
+	public String getRepresentationId() {
+		return this.representationId;
+	}
+
+	/**
+	 * Return the label.
+	 *
+	 * @return the label
+	 */
+	public String getLabel() {
+		return this.label;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/RepresentationsDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/RepresentationsDto.java
new file mode 100644
index 0000000000..29d7123a34
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/representations/RepresentationsDto.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.representations;
+
+import java.util.List;
+
+/**
+ * The main DTO for the representations.
+ *
+ * @author sbegaudeau
+ */
+public class RepresentationsDto {
+	/**
+	 * The representations.
+	 */
+	private List<RepresentationDto> representations;
+
+	/**
+	 * The constructor.
+	 * 
+	 * @param representations
+	 *            The representations
+	 */
+	public RepresentationsDto(List<RepresentationDto> representations) {
+		this.representations = representations;
+	}
+
+	/**
+	 * Return the representations.
+	 *
+	 * @return the representations
+	 */
+	public List<RepresentationDto> getRepresentations() {
+		return this.representations;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/ISiriusSessionService.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/ISiriusSessionService.java
new file mode 100644
index 0000000000..87e08a95f2
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/ISiriusSessionService.java
@@ -0,0 +1,25 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.sessions;
+
+/**
+ * The service class used to manipulate the Sirius sessions.
+ *
+ * @author sbegaudeau
+ */
+public interface ISiriusSessionService {
+	/**
+	 * Returns the Sirius sessions.
+	 * 
+	 * @return The Sirius sessions
+	 */
+	SessionsDto getSessions();
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/SessionDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/SessionDto.java
new file mode 100644
index 0000000000..f49fb9014e
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/SessionDto.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.sessions;
+
+/**
+ * The session.
+ *
+ * @author sbegaudeau
+ */
+public class SessionDto {
+	/**
+	 * The session id.
+	 */
+	private String sessionId;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param sessionId
+	 *            The session id
+	 */
+	public SessionDto(String sessionId) {
+		this.sessionId = sessionId;
+	}
+
+	/**
+	 * Return the sessionId.
+	 *
+	 * @return the sessionId
+	 */
+	public String getSessionId() {
+		return this.sessionId;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/SessionsDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/SessionsDto.java
new file mode 100644
index 0000000000..43f0a5ba7a
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/sessions/SessionsDto.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.sessions;
+
+import java.util.List;
+
+/**
+ * The list of the sessions.
+ *
+ * @author sbegaudeau
+ */
+public class SessionsDto {
+	/**
+	 * The sessions.
+	 */
+	private List<SessionDto> sessions;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param sessions
+	 *            The sessions.
+	 */
+	public SessionsDto(List<SessionDto> sessions) {
+		this.sessions = sessions;
+	}
+
+	/**
+	 * Return the sessions.
+	 *
+	 * @return the sessions
+	 */
+	public List<SessionDto> getSessions() {
+		return this.sessions;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/ActionDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/ActionDto.java
new file mode 100644
index 0000000000..0f254faead
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/ActionDto.java
@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.workflow;
+
+/**
+ * The action.
+ *
+ * @author sbegaudeau
+ */
+public class ActionDto {
+	/**
+	 * The identifier.
+	 */
+	private String identifier;
+
+	/**
+	 * The label.
+	 */
+	private String label;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param identifier
+	 *            The identifier
+	 *
+	 * @param label
+	 *            The label
+	 */
+	public ActionDto(String identifier, String label) {
+		this.identifier = identifier;
+		this.label = label;
+	}
+
+	/**
+	 * Return the identifier.
+	 *
+	 * @return the identifier
+	 */
+	public String getIdentifier() {
+		return this.identifier;
+	}
+
+	/**
+	 * Return the label.
+	 *
+	 * @return the label
+	 */
+	public String getLabel() {
+		return this.label;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/ISiriusWorkflowService.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/ISiriusWorkflowService.java
new file mode 100644
index 0000000000..f51e464b26
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/ISiriusWorkflowService.java
@@ -0,0 +1,40 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.workflow;
+
+import java.util.Optional;
+
+/**
+ * The service class used to manipulate Sirius workflows.
+ *
+ * @author sbegaudeau
+ */
+public interface ISiriusWorkflowService {
+	/**
+	 * Returns the workflow of the session with the given sessionId.
+	 *
+	 * @param sessionId
+	 *            The identifier of the session
+	 * @return The workflow of the session or an empty optional if none has been found
+	 */
+	Optional<WorkflowDto> getWorkflow(String sessionId);
+
+	/**
+	 * Returns the page with the given pageId.
+	 *
+	 * @param sessionId
+	 *            The identifier of the session
+	 * @param pageId
+	 *            The identifier of the page
+	 * @return An optional containing the page found, or an empty optional
+	 */
+	Optional<PageDto> getPage(String sessionId, String pageId);
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/PageDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/PageDto.java
new file mode 100644
index 0000000000..366b1944a6
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/PageDto.java
@@ -0,0 +1,128 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.workflow;
+
+import java.util.List;
+
+/**
+ * The page.
+ *
+ * @author sbegaudeau
+ */
+public class PageDto {
+	/**
+	 * The identifier of the page.
+	 */
+	private String pageId;
+
+	/**
+	 * The label.
+	 */
+	private String label;
+
+	/**
+	 * The description.
+	 */
+	private String description;
+
+	/**
+	 * The identifier of the previous page.
+	 */
+	private String previousPageId;
+
+	/**
+	 * The identifier of the next page.
+	 */
+	private String nextPageId;
+
+	/**
+	 * The sections.
+	 */
+	private List<SectionDto> sections;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param pageId
+	 *            The identifier of the page
+	 * @param label
+	 *            The label
+	 * @param description
+	 *            The description
+	 * @param previousPageId
+	 *            The identifier of the previous page
+	 * @param nextPageId
+	 *            The identifier of the next page
+	 * @param sections
+	 *            The sections
+	 */
+	public PageDto(String pageId, String label, String description, String previousPageId, String nextPageId, List<SectionDto> sections) {
+		this.label = label;
+		this.description = description;
+		this.previousPageId = previousPageId;
+		this.nextPageId = nextPageId;
+		this.sections = sections;
+	}
+
+	/**
+	 * Return the pageId.
+	 *
+	 * @return the pageId
+	 */
+	public String getPageId() {
+		return this.pageId;
+	}
+
+	/**
+	 * Return the label.
+	 *
+	 * @return the label
+	 */
+	public String getLabel() {
+		return this.label;
+	}
+
+	/**
+	 * Return the description.
+	 *
+	 * @return the description
+	 */
+	public String getDescription() {
+		return this.description;
+	}
+
+	/**
+	 * Return the previousPageId.
+	 *
+	 * @return the previousPageId
+	 */
+	public String getPreviousPageId() {
+		return this.previousPageId;
+	}
+
+	/**
+	 * Return the nextPageId.
+	 *
+	 * @return the nextPageId
+	 */
+	public String getNextPageId() {
+		return this.nextPageId;
+	}
+
+	/**
+	 * Return the sections.
+	 *
+	 * @return the sections
+	 */
+	public List<SectionDto> getSections() {
+		return this.sections;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/SectionDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/SectionDto.java
new file mode 100644
index 0000000000..6dfdb5461e
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/SectionDto.java
@@ -0,0 +1,61 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.workflow;
+
+import java.util.List;
+
+/**
+ * The section.
+ *
+ * @author sbegaudeau
+ */
+public class SectionDto {
+	/**
+	 * The label.
+	 */
+	private String label;
+
+	/**
+	 * The actions of the section.
+	 */
+	private List<ActionDto> actions;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param label
+	 *            The label
+	 * @param actions
+	 *            The actions
+	 */
+	public SectionDto(String label, List<ActionDto> actions) {
+		this.label = label;
+		this.actions = actions;
+	}
+
+	/**
+	 * Return the label.
+	 *
+	 * @return the label
+	 */
+	public String getLabel() {
+		return this.label;
+	}
+
+	/**
+	 * Return the actions.
+	 *
+	 * @return the actions
+	 */
+	public List<ActionDto> getActions() {
+		return this.actions;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/SimplePageDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/SimplePageDto.java
new file mode 100644
index 0000000000..edc4bcb66a
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/SimplePageDto.java
@@ -0,0 +1,76 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.workflow;
+
+/**
+ * A simple version of the page.
+ *
+ * @author sbegaudeau
+ */
+public class SimplePageDto {
+	/**
+	 * The identifier of the page.
+	 */
+	private String pageId;
+
+	/**
+	 * The label.
+	 */
+	private String label;
+
+	/**
+	 * The description.
+	 */
+	private String description;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param pageId
+	 *            The identifier of the page
+	 * @param label
+	 *            The label
+	 * @param description
+	 *            The description
+	 */
+	public SimplePageDto(String pageId, String label, String description) {
+		this.pageId = pageId;
+		this.label = label;
+		this.description = description;
+	}
+
+	/**
+	 * Return the pageId.
+	 *
+	 * @return the pageId
+	 */
+	public String getPageId() {
+		return this.pageId;
+	}
+
+	/**
+	 * Return the label.
+	 *
+	 * @return the label
+	 */
+	public String getLabel() {
+		return this.label;
+	}
+
+	/**
+	 * Return the description.
+	 *
+	 * @return the description
+	 */
+	public String getDescription() {
+		return this.description;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/WorkflowDto.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/WorkflowDto.java
new file mode 100644
index 0000000000..809934ba87
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/api/workflow/WorkflowDto.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.api.workflow;
+
+import java.util.List;
+
+/**
+ * The workflow.
+ *
+ * @author sbegaudeau
+ */
+public class WorkflowDto {
+	/**
+	 * The pages of the workflow.
+	 */
+	private List<SimplePageDto> pages;
+
+	/**
+	 * The constructor.
+	 *
+	 * @param pages
+	 *            The pages of the workflow
+	 */
+	public WorkflowDto(List<SimplePageDto> pages) {
+		this.pages = pages;
+	}
+
+	/**
+	 * Return the pages of the workflow.
+	 *
+	 * @return the pages of the workflow
+	 */
+	public List<SimplePageDto> getPages() {
+		return this.pages;
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/representations/SiriusRepresentationService.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/representations/SiriusRepresentationService.java
new file mode 100644
index 0000000000..b13204efe8
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/representations/SiriusRepresentationService.java
@@ -0,0 +1,133 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.internal.representations;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.ecore.resource.ResourceSet;
+import org.eclipse.emf.ecore.util.EcoreUtil;
+import org.eclipse.jface.wizard.WizardDialog;
+import org.eclipse.sirius.business.api.dialect.DialectManager;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.business.api.session.SessionManager;
+import org.eclipse.sirius.ui.business.api.dialect.DialectUIManager;
+import org.eclipse.sirius.ui.tools.internal.views.common.item.RepresentationDescriptionItemImpl;
+import org.eclipse.sirius.ui.tools.internal.wizards.CreateRepresentationWizard;
+import org.eclipse.sirius.viewpoint.DRepresentation;
+import org.eclipse.sirius.viewpoint.DRepresentationDescriptor;
+import org.eclipse.sirius.viewpoint.description.RepresentationDescription;
+import org.eclipse.sirius.workflow.services.api.SiriusServicesUtils;
+import org.eclipse.sirius.workflow.services.api.representations.CreateRepresentationDto;
+import org.eclipse.sirius.workflow.services.api.representations.ISiriusRepresentationService;
+import org.eclipse.sirius.workflow.services.api.representations.OpenRepresentationDto;
+import org.eclipse.sirius.workflow.services.api.representations.RepresentationDto;
+import org.eclipse.sirius.workflow.services.api.representations.RepresentationsDto;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.ui.PlatformUI;
+
+/**
+ * The implementation of the Sirius service for representations.
+ *
+ * @author sbegaudeau
+ */
+public class SiriusRepresentationService implements ISiriusRepresentationService {
+
+	@Override
+	public RepresentationsDto getRepresentations(String sessionId) {
+		return this.findSessionById(sessionId).map(session -> {
+			List<RepresentationDto> representations = DialectManager.INSTANCE.getAllRepresentationDescriptors(session).stream().map(descriptor -> {
+				URI uri = EcoreUtil.getURI(descriptor);
+				return new RepresentationDto(SiriusServicesUtils.encode(uri.toString()), descriptor.getName());
+			}).collect(Collectors.toList());
+			return new RepresentationsDto(representations);
+		}).orElse(new RepresentationsDto(new ArrayList<>()));
+	}
+
+	/**
+	 * Returns the session with the identifier matching the given session identifier.
+	 *
+	 * @param sessionId
+	 *            The encoded session identifier
+	 * @return An optional with the session found or an empty optional if no matching session has been found
+	 */
+	private Optional<Session> findSessionById(String sessionId) {
+		// @formatter:off
+		return SessionManager.INSTANCE.getSessions().stream()
+				.filter(session -> sessionId.equals(session.getID()))
+				.findFirst();
+		// @formatter:on
+	}
+
+	@Override
+	public Optional<RepresentationDto> createRepresentation(String sessionId, CreateRepresentationDto createRepresentationDto) {
+		// @formatter:off
+		return this.findSessionById(sessionId).flatMap(session -> {
+			return this.findRepresentationDescription(session, createRepresentationDto.getRepresentationId()).flatMap(representationDescription -> {
+			    // return DialectManager.INSTANCE.createRepresentation(name, semantic, representationDescription, session, null);
+				RepresentationDescriptionItemImpl item = new RepresentationDescriptionItemImpl(session, representationDescription, null);
+				CreateRepresentationWizard wizard = new CreateRepresentationWizard(session, item);
+				wizard.init();
+
+				Display display = PlatformUI.getWorkbench().getDisplay();
+				display.syncExec(() -> {
+					final WizardDialog dialog = new WizardDialog(display.getActiveShell(), wizard);
+					dialog.setMinimumPageSize(CreateRepresentationWizard.MIN_PAGE_WIDTH, CreateRepresentationWizard.MIN_PAGE_HEIGHT);
+					dialog.create();
+					dialog.getShell().setText("Create Representation"); //$NON-NLS-1$
+					dialog.open();
+				});
+				return Optional.empty();
+			});
+		});
+		// @formatter:on
+	}
+
+	/**
+	 * Locate a {@link RepresentationDescription} in a session's enabled Viewpoints from its identifier.
+	 *
+	 * @param session
+	 *            the session.
+	 * @param representationDescriptionId
+	 *            the identified of the {@link RepresentationDescription} to find.
+	 * @return the {@link RepresentationDescription}, if it could be found.
+	 */
+	private Optional<RepresentationDescription> findRepresentationDescription(Session session, String representationDescriptionId) {
+		// @formatter:off
+		return session.getSelectedViewpoints(true).stream()
+				.flatMap(viewpoint -> viewpoint.getOwnedRepresentations().stream())
+				.filter(representationDescription -> representationDescriptionId.equals(representationDescription.getName()))
+				.findFirst();
+		// @formatter:on
+	}
+
+	@Override
+	public Optional<RepresentationDto> openRepresentation(String sessionId, OpenRepresentationDto openRepresentationDto) {
+		return this.findSessionById(sessionId).flatMap(session -> {
+			String representationDescriptionId = SiriusServicesUtils.decode(openRepresentationDto.getRepresentationId());
+			ResourceSet resourceSet = session.getTransactionalEditingDomain().getResourceSet();
+			DRepresentationDescriptor representationDescriptor = (DRepresentationDescriptor) resourceSet
+					.getEObject(URI.createURI(representationDescriptionId), false);
+			DRepresentation representation = representationDescriptor.getRepresentation();
+
+			PlatformUI.getWorkbench().getDisplay().syncExec(() -> {
+				DialectUIManager.INSTANCE.openEditor(session, representation, new NullProgressMonitor());
+			});
+
+			return Optional.empty();
+		});
+	}
+
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/sessions/SiriusSessionService.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/sessions/SiriusSessionService.java
new file mode 100644
index 0000000000..055abaa0bc
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/sessions/SiriusSessionService.java
@@ -0,0 +1,37 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.internal.sessions;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.eclipse.sirius.business.api.session.SessionManager;
+import org.eclipse.sirius.workflow.services.api.SiriusServicesUtils;
+import org.eclipse.sirius.workflow.services.api.sessions.ISiriusSessionService;
+import org.eclipse.sirius.workflow.services.api.sessions.SessionDto;
+import org.eclipse.sirius.workflow.services.api.sessions.SessionsDto;
+
+/**
+ * The implementation of the Sirius session service.
+ *
+ * @author sbegaudeau
+ */
+public class SiriusSessionService implements ISiriusSessionService {
+
+	@Override
+	public SessionsDto getSessions() {
+		List<SessionDto> sessionDtos = SessionManager.INSTANCE.getSessions().stream().map(session -> {
+			return new SessionDto(SiriusServicesUtils.encode(session.getID()));
+		}).collect(Collectors.toList());
+		return new SessionsDto(sessionDtos);
+	}
+
+}
diff --git a/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/workflow/SiriusWorkflowService.java b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/workflow/SiriusWorkflowService.java
new file mode 100644
index 0000000000..2a4f18125b
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.services/src/org/eclipse/sirius/workflow/services/internal/workflow/SiriusWorkflowService.java
@@ -0,0 +1,255 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.services.internal.workflow;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.sirius.business.api.query.EObjectQuery;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.business.api.session.SessionManager;
+import org.eclipse.sirius.business.internal.session.danalysis.DAnalysisSessionImpl;
+import org.eclipse.sirius.common.tools.api.interpreter.EvaluationException;
+import org.eclipse.sirius.common.tools.api.interpreter.IInterpreter;
+import org.eclipse.sirius.ext.base.Option;
+import org.eclipse.sirius.viewpoint.description.DescriptionPackage;
+import org.eclipse.sirius.viewpoint.description.Group;
+import org.eclipse.sirius.workflow.ActivityDescription;
+import org.eclipse.sirius.workflow.PageDescription;
+import org.eclipse.sirius.workflow.SectionDescription;
+import org.eclipse.sirius.workflow.WorkflowDescription;
+import org.eclipse.sirius.workflow.services.api.workflow.ActionDto;
+import org.eclipse.sirius.workflow.services.api.workflow.ISiriusWorkflowService;
+import org.eclipse.sirius.workflow.services.api.workflow.PageDto;
+import org.eclipse.sirius.workflow.services.api.workflow.SectionDto;
+import org.eclipse.sirius.workflow.services.api.workflow.SimplePageDto;
+import org.eclipse.sirius.workflow.services.api.workflow.WorkflowDto;
+
+/**
+ * The implementation of the Sirius workflow service.
+ *
+ * @author sbegaudeau
+ */
+public class SiriusWorkflowService implements ISiriusWorkflowService {
+
+	@Override
+	public Optional<WorkflowDto> getWorkflow(String sessionId) {
+		URI sessionResourceURI = URI.createURI(sessionId);
+		return Optional.ofNullable(SessionManager.INSTANCE.getExistingSession(sessionResourceURI)).flatMap(this::computeWorkflow);
+	}
+
+	/**
+	 * Computes the workflow of the given session.
+	 *
+	 * @param session
+	 *            The session
+	 * @return The workflow computed form the session
+	 */
+	private Optional<WorkflowDto> computeWorkflow(Session session) {
+		// @formatter:off
+		List<SimplePageDto> pageDtos = this.getWorkflowDescriptions(session)
+				.map(WorkflowDescription::getPages)
+				.flatMap(Collection::stream)
+				.flatMap(pageDescription -> this.computeSimplePage(session, pageDescription))
+				.collect(Collectors.toList());
+		// @formatter:on
+		if (pageDtos.size() > 0) {
+			return Optional.of(new WorkflowDto(pageDtos));
+		}
+		return Optional.empty();
+	}
+
+	/**
+	 * Returns the workflow descriptions from the given session.
+	 *
+	 * @param session
+	 *            The session
+	 * @return The workflow descriptions from the given session
+	 */
+	private Stream<WorkflowDescription> getWorkflowDescriptions(Session session) {
+		// @formatter:off
+		return session.getSelectedViewpoints(true).stream()
+				.map(viewpoint -> new EObjectQuery(viewpoint).getFirstAncestorOfType(DescriptionPackage.Literals.GROUP))
+				.filter(Option::some)
+				.map(Option::get)
+				.filter(Group.class::isInstance)
+				.map(Group.class::cast)
+				.flatMap(group -> group.getExtensions().stream())
+				.filter(WorkflowDescription.class::isInstance)
+				.map(WorkflowDescription.class::cast);
+		// @formatter:on
+	}
+
+	/**
+	 * Computes a pageDto for the given pageDescription.
+	 *
+	 * @param session
+	 *            the session.
+	 * @param pageDescription
+	 *            The page description
+	 * @return The simplePageDto computed
+	 */
+	private Stream<SimplePageDto> computeSimplePage(Session session, PageDescription pageDescription) {
+		IInterpreter itp = session.getInterpreter();
+		EObject self = ((DAnalysisSessionImpl) session).getAnalyses().iterator().next();
+		try {
+			String title = itp.evaluateString(self, pageDescription.getTitleExpression());
+			String description = itp.evaluateString(self, pageDescription.getDescriptionExpression());
+			return Stream.of(new SimplePageDto(pageDescription.getName(), title, description));
+		} catch (EvaluationException e) {
+			return Stream.empty();
+		}
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * @see org.obeonetwork.jarvis.server.sirius.api.services.workflow.IJarvisSiriusWorkflowService#getPage(java.lang.String,
+	 *      java.lang.String)
+	 */
+	@Override
+	public Optional<PageDto> getPage(String sessionId, String pageId) {
+		// @formatter:off
+		Optional<PageDto> optionalPageDto = SessionManager.INSTANCE.getSessions().stream()
+			.filter(session -> sessionId.equals(session.getID()))
+			.findFirst()
+			.flatMap(session -> {
+				return this.getWorkflowDescriptions(session)
+					.map(WorkflowDescription::getPages)
+					.flatMap(Collection::stream)
+					.filter(pageDescription -> Objects.equals(pageId, pageDescription.getName()))
+					.findFirst()
+					.flatMap(pageDescription -> this.convert(session, pageDescription));
+			});
+		// @formatter:on
+		return optionalPageDto;
+	}
+
+	/**
+	 * Converts the given description into an optional containing a page dto or an empty page dto.
+	 *
+	 * @param session
+	 *            The Sirius session
+	 * @param pageDescription
+	 *            The page description
+	 * @return An optional containing the converted page dto
+	 */
+	private Optional<PageDto> convert(Session session, PageDescription pageDescription) {
+		IInterpreter itp = session.getInterpreter();
+		EObject self = ((DAnalysisSessionImpl) session).getAnalyses().iterator().next();
+		try {
+			String pageId = pageDescription.getName();
+			String label = itp.evaluateString(self, pageDescription.getTitleExpression());
+			String description = itp.evaluateString(self, pageDescription.getDescriptionExpression());
+
+			Optional<String> optionalPreviousPageId = this.getPreviousPageId(pageDescription);
+			Optional<String> optionalNextPageId = this.getNextPageId(pageDescription);
+
+			// @formatter:off
+			List<SectionDto> sectionDtos = pageDescription.getSections().stream()
+				.flatMap(sectionDescription -> this.convert(session, sectionDescription))
+				.collect(Collectors.toList());
+			// @formatter:on
+
+			return Optional
+					.of(new PageDto(pageId, label, description, optionalPreviousPageId.orElse(null), optionalNextPageId.orElse(null), sectionDtos));
+		} catch (EvaluationException e) {
+			return Optional.empty();
+		}
+	}
+
+	/**
+	 * Returns an optional containing the next page identifier or an empty optional if it is the last page.
+	 *
+	 * @param pageDescription
+	 *            The page description
+	 * @return An optional containing the next page identifier or an empty optional if it is the last page
+	 */
+	private Optional<String> getNextPageId(PageDescription pageDescription) {
+		WorkflowDescription workflow = (WorkflowDescription) pageDescription.eContainer();
+		int index = workflow.getPages().indexOf(pageDescription);
+		if (index + 1 < workflow.getPages().size()) {
+			return Optional.of(workflow.getPages().get(index + 1).getName());
+		}
+		return Optional.empty();
+	}
+
+	/**
+	 * Returns an optional containing the previous page identifier or an empty optional if it is the first page.
+	 *
+	 * @param pageDescription
+	 *            The page description
+	 * @return An optional containing the previous page identifier or an empty optional if it is the first page
+	 */
+	private Optional<String> getPreviousPageId(PageDescription pageDescription) {
+		WorkflowDescription workflow = (WorkflowDescription) pageDescription.eContainer();
+		int index = workflow.getPages().indexOf(pageDescription);
+		if (index > 0) {
+			return Optional.of(workflow.getPages().get(index - 1).getName());
+		}
+		return Optional.empty();
+	}
+
+	/**
+	 * Converts the given section description into a stream with one section dto or an empty stream if an error occurs.
+	 *
+	 * @param session
+	 *            The Sirius session
+	 * @param sectionDescription
+	 *            The section description
+	 * @return A stream containing the converted section description
+	 */
+	private Stream<SectionDto> convert(Session session, SectionDescription sectionDescription) {
+		IInterpreter itp = session.getInterpreter();
+		EObject self = ((DAnalysisSessionImpl) session).getAnalyses().iterator().next();
+		try {
+			String label = itp.evaluateString(self, sectionDescription.getTitleExpression());
+
+			// @formatter:off
+			List<ActionDto> actions = sectionDescription.getActivities().stream()
+					.flatMap(activityDescription -> this.convert(session, activityDescription))
+					.collect(Collectors.toList());
+			// @formatter:on
+
+			return Stream.of(new SectionDto(label, actions));
+		} catch (EvaluationException e) {
+			return Stream.empty();
+		}
+	}
+
+	/**
+	 * Converts the given activity description into stream containing one action dto or an empty stream if an error
+	 * occurs.
+	 *
+	 * @param session
+	 *            The Sirius session
+	 * @param activityDescription
+	 *            The activity description
+	 * @return A stream containing the converted action dto
+	 */
+	private Stream<ActionDto> convert(Session session, ActivityDescription activityDescription) {
+		IInterpreter itp = session.getInterpreter();
+		EObject self = ((DAnalysisSessionImpl) session).getAnalyses().iterator().next();
+		try {
+			String actionId = activityDescription.getName();
+			String label = itp.evaluateString(self, activityDescription.getLabelExpression());
+			return Stream.of(new ActionDto(actionId, label));
+		} catch (EvaluationException e) {
+			return Stream.empty();
+		}
+	}
+}
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.checkstyle b/plugins/org.eclipse.sirius.workflow.ui.page/.checkstyle
new file mode 100644
index 0000000000..3c756ff819
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.checkstyle
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<fileset-config file-format-version="1.2.0" simple-config="true" sync-formatter="false">
+  <local-check-config name="Sirius Checks" location="/org.eclipse.sirius.settings/CheckstyleConfiguration.xml" type="project" description="">
+    <additional-data name="protect-config-file" value="false"/>
+  </local-check-config>
+  <fileset name="all" enabled="true" check-config-name="Sirius Checks" local="true">
+    <file-match-pattern match-pattern="." include-pattern="true"/>
+  </fileset>
+  <filter name="FilesFromPackage" enabled="true">
+    <filter-data value="src-gen"/>
+  </filter>
+</fileset-config>
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.classpath b/plugins/org.eclipse.sirius.workflow.ui.page/.classpath
new file mode 100644
index 0000000000..eca7bdba8f
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.project b/plugins/org.eclipse.sirius.workflow.ui.page/.project
new file mode 100644
index 0000000000..020f9c6392
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.project
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.eclipse.sirius.workflow.ui.page</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/fr.obeo.baseliner.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/fr.obeo.baseliner.prefs
new file mode 100644
index 0000000000..edbf92725a
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/fr.obeo.baseliner.prefs
@@ -0,0 +1,2 @@
+baselineSource=platform\:/resource/org.eclipse.sirius.targets/baseline.target
+eclipse.preferences.version=1
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.core.resources.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000000..9093a2c880
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,4 @@
+#Thu Jan 26 14:35:58 CET 2012
+eclipse.preferences.version=1
+encoding/<project>=US-ASCII
+encoding/analysis_templates=ISO-8859-1
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.core.runtime.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.core.runtime.prefs
new file mode 100644
index 0000000000..a287fefdba
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.core.runtime.prefs
@@ -0,0 +1,3 @@
+#Mon Sep 24 15:04:19 CEST 2007
+eclipse.preferences.version=1
+line.separator=\n
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.jdt.core.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000000..97c066b909
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,354 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_array_initializer=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_block=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_constructor_declaration=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_enum_constant=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_enum_declaration=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_method_declaration=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_switch=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_type_declaration=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_allocation_expression=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_reference=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_bracket_in_array_type_reference=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_annotation=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_annotation_type_member_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_catch=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_constructor_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_enum_constant=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_for=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_if=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_method_invocation=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_parenthesized_expression=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_switch=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_synchronized=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_try=insert
+org.eclipse.jdt.core.formatter.insert_space_before_opening_paren_in_while=insert
+org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_return=insert
+org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_throw=insert
+org.eclipse.jdt.core.formatter.insert_space_before_postfix_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_prefix_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_question_in_conditional=insert
+org.eclipse.jdt.core.formatter.insert_space_before_question_in_wildcard=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_for=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_semicolon_in_try_resources=do not insert
+org.eclipse.jdt.core.formatter.insert_space_before_unary_operator=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_brackets_in_array_type_reference=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_braces_in_array_initializer=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_brackets_in_array_allocation_expression=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_annotation_type_member_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_constructor_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_enum_constant=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_declaration=do not insert
+org.eclipse.jdt.core.formatter.insert_space_between_empty_parens_in_method_invocation=do not insert
+org.eclipse.jdt.core.formatter.join_lines_in_comments=true
+org.eclipse.jdt.core.formatter.join_wrapped_lines=true
+org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.keep_empty_array_initializer_on_one_line=false
+org.eclipse.jdt.core.formatter.keep_imple_if_on_one_line=false
+org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.lineSplit=200
+org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body=0
+org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve=1
+org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line=false
+org.eclipse.jdt.core.formatter.tabulation.char=space
+org.eclipse.jdt.core.formatter.tabulation.size=4
+org.eclipse.jdt.core.formatter.use_on_off_tags=true
+org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
+org.eclipse.jdt.core.formatter.wrap_before_binary_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_or_operator_multicatch=true
+org.eclipse.jdt.core.formatter.wrap_outer_expressions_when_nested=true
+org.eclipse.jdt.core.compiler.problem.unavoidableGenericTypeProblems=disabled
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.jdt.ui.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.jdt.ui.prefs
new file mode 100644
index 0000000000..f903dbceb5
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.jdt.ui.prefs
@@ -0,0 +1,62 @@
+cleanup.add_default_serial_version_id=true
+cleanup.add_generated_serial_version_id=false
+cleanup.add_missing_annotations=true
+cleanup.add_missing_deprecated_annotations=true
+cleanup.add_missing_methods=false
+cleanup.add_missing_nls_tags=false
+cleanup.add_missing_override_annotations=true
+cleanup.add_missing_override_annotations_interface_methods=true
+cleanup.add_serial_version_id=true
+cleanup.always_use_blocks=true
+cleanup.always_use_parentheses_in_expressions=false
+cleanup.always_use_this_for_non_static_field_access=false
+cleanup.always_use_this_for_non_static_method_access=false
+cleanup.convert_to_enhanced_for_loop=true
+cleanup.correct_indentation=true
+cleanup.format_source_code=true
+cleanup.format_source_code_changes_only=false
+cleanup.make_local_variable_final=true
+cleanup.make_parameters_final=false
+cleanup.make_private_fields_final=true
+cleanup.make_type_abstract_if_missing_method=false
+cleanup.make_variable_declarations_final=false
+cleanup.never_use_blocks=false
+cleanup.never_use_parentheses_in_expressions=true
+cleanup.organize_imports=true
+cleanup.qualify_static_field_accesses_with_declaring_class=true
+cleanup.qualify_static_member_accesses_through_instances_with_declaring_class=true
+cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=true
+cleanup.qualify_static_member_accesses_with_declaring_class=true
+cleanup.qualify_static_method_accesses_with_declaring_class=true
+cleanup.remove_private_constructors=true
+cleanup.remove_trailing_whitespaces=true
+cleanup.remove_trailing_whitespaces_all=true
+cleanup.remove_trailing_whitespaces_ignore_empty=false
+cleanup.remove_unnecessary_casts=true
+cleanup.remove_unnecessary_nls_tags=true
+cleanup.remove_unused_imports=true
+cleanup.remove_unused_local_variables=false
+cleanup.remove_unused_private_fields=true
+cleanup.remove_unused_private_members=false
+cleanup.remove_unused_private_methods=true
+cleanup.remove_unused_private_types=true
+cleanup.sort_members=false
+cleanup.sort_members_all=false
+cleanup.use_blocks=true
+cleanup.use_blocks_only_for_return_and_throw=false
+cleanup.use_parentheses_in_expressions=false
+cleanup.use_this_for_non_static_field_access=false
+cleanup.use_this_for_non_static_field_access_only_if_necessary=true
+cleanup.use_this_for_non_static_method_access=false
+cleanup.use_this_for_non_static_method_access_only_if_necessary=true
+cleanup_profile=_Sirius
+cleanup_settings_version=2
+eclipse.preferences.version=1
+formatter_profile=_Sirius
+formatter_settings_version=12
+org.eclipse.jdt.ui.ignorelowercasenames=true
+org.eclipse.jdt.ui.importorder=java;javax;org;com;
+org.eclipse.jdt.ui.javadoc=false
+org.eclipse.jdt.ui.ondemandthreshold=99
+org.eclipse.jdt.ui.staticondemandthreshold=99
+org.eclipse.jdt.ui.text.custom_code_templates=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?><templates><template autoinsert\="true" context\="gettercomment_context" deleted\="false" description\="Comment for getter method" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.gettercomment" name\="gettercomment">/**\n * @return the ${bare_field_name}\n */</template><template autoinsert\="true" context\="settercomment_context" deleted\="false" description\="Comment for setter method" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.settercomment" name\="settercomment">/**\n * @param ${param} the ${bare_field_name} to set\n */</template><template autoinsert\="true" context\="constructorcomment_context" deleted\="false" description\="Comment for created constructors" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.constructorcomment" name\="constructorcomment">/**\n * ${tags}\n */</template><template autoinsert\="true" context\="filecomment_context" deleted\="false" description\="Comment for created Java files" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.filecomment" name\="filecomment">/**\n * \n */</template><template autoinsert\="true" context\="typecomment_context" deleted\="false" description\="Comment for created types" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.typecomment" name\="typecomment">/**\n * @author ${user}\n *\n * ${tags}\n */</template><template autoinsert\="true" context\="fieldcomment_context" deleted\="false" description\="Comment for fields" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.fieldcomment" name\="fieldcomment">/**\n * \n */</template><template autoinsert\="true" context\="methodcomment_context" deleted\="false" description\="Comment for non-overriding methods" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.methodcomment" name\="methodcomment">/**\n * ${tags}\n */</template><template autoinsert\="true" context\="overridecomment_context" deleted\="false" description\="Comment for overriding methods" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.overridecomment" name\="overridecomment">/* (non-Javadoc)\n * ${see_to_overridden}\n */</template><template autoinsert\="true" context\="delegatecomment_context" deleted\="false" description\="Comment for delegate methods" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.delegatecomment" name\="delegatecomment">/**\n * ${tags}\n * ${see_to_target}\n */</template><template autoinsert\="true" context\="newtype_context" deleted\="false" description\="Newly created files" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.newtype" name\="newtype">${filecomment}\n${package_declaration}\n\n${typecomment}\n${type_declaration}</template><template autoinsert\="true" context\="classbody_context" deleted\="false" description\="Code in new class type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.classbody" name\="classbody">\n</template><template autoinsert\="true" context\="interfacebody_context" deleted\="false" description\="Code in new interface type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.interfacebody" name\="interfacebody">\n</template><template autoinsert\="true" context\="enumbody_context" deleted\="false" description\="Code in new enum type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.enumbody" name\="enumbody">\n</template><template autoinsert\="true" context\="annotationbody_context" deleted\="false" description\="Code in new annotation type bodies" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.annotationbody" name\="annotationbody">\n</template><template autoinsert\="true" context\="catchblock_context" deleted\="false" description\="Code in new catch blocks" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.catchblock" name\="catchblock">// ${todo} Auto-generated catch block\n${exception_var}.printStackTrace();</template><template autoinsert\="true" context\="methodbody_context" deleted\="false" description\="Code in created method stubs" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.methodbody" name\="methodbody">// ${todo} Auto-generated method stub\n${body_statement}</template><template autoinsert\="true" context\="constructorbody_context" deleted\="false" description\="Code in created constructor stubs" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.constructorbody" name\="constructorbody">${body_statement}\n// ${todo} Auto-generated constructor stub</template><template autoinsert\="true" context\="getterbody_context" deleted\="false" description\="Code in created getters" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.getterbody" name\="getterbody">return ${field};</template><template autoinsert\="true" context\="setterbody_context" deleted\="false" description\="Code in created setters" enabled\="true" id\="org.eclipse.jdt.ui.text.codetemplates.setterbody" name\="setterbody">${field} \= ${param};</template></templates>
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.ltk.core.refactoring.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.ltk.core.refactoring.prefs
new file mode 100644
index 0000000000..b196c64a34
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.ltk.core.refactoring.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+org.eclipse.ltk.core.refactoring.enable.project.refactoring.history=false
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.pde.prefs b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.pde.prefs
new file mode 100644
index 0000000000..c307a7b58e
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/.settings/org.eclipse.pde.prefs
@@ -0,0 +1,32 @@
+compilers.f.unresolved-features=1
+compilers.f.unresolved-plugins=1
+compilers.incompatible-environment=0
+compilers.p.build=0
+compilers.p.build.bin.includes=0
+compilers.p.build.encodings=0
+compilers.p.build.java.compiler=0
+compilers.p.build.java.compliance=0
+compilers.p.build.missing.output=0
+compilers.p.build.output.library=0
+compilers.p.build.source.library=0
+compilers.p.build.src.includes=0
+compilers.p.deprecated=1
+compilers.p.discouraged-class=1
+compilers.p.internal=0
+compilers.p.missing-packages=0
+compilers.p.missing-version-export-package=1
+compilers.p.missing-version-import-package=1
+compilers.p.missing-version-require-bundle=0
+compilers.p.no-required-att=0
+compilers.p.not-externalized-att=0
+compilers.p.unknown-attribute=1
+compilers.p.unknown-class=1
+compilers.p.unknown-element=1
+compilers.p.unknown-identifier=0
+compilers.p.unknown-resource=0
+compilers.p.unresolved-ex-points=0
+compilers.p.unresolved-import=0
+compilers.s.create-docs=false
+compilers.s.doc-folder=doc
+compilers.s.open-tags=1
+eclipse.preferences.version=1
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/META-INF/MANIFEST.MF b/plugins/org.eclipse.sirius.workflow.ui.page/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000..e818e70fc7
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/META-INF/MANIFEST.MF
@@ -0,0 +1,23 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: %pluginName
+Bundle-Vendor: %providerName
+Bundle-SymbolicName: org.eclipse.sirius.workflow.ui.page;singleton:=true
+Bundle-Version: 6.0.0.qualifier
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
+Require-Bundle: org.eclipse.sirius.ui.editor;bundle-version="6.0.0",
+ org.eclipse.ui.forms;bundle-version="3.7.100",
+ org.eclipse.ui;bundle-version="3.109.0",
+ org.eclipse.sirius.common;bundle-version="6.0.0",
+ org.eclipse.sirius.ui;bundle-version="6.0.0",
+ org.eclipse.emf.transaction;bundle-version="1.9.0",
+ org.eclipse.ui.browser;bundle-version="3.6.100",
+ org.eclipse.sirius.ecore.extender;bundle-version="5.1.0",
+ org.eclipse.sirius.server;bundle-version="6.0.0"
+Bundle-ActivationPolicy: lazy
+Bundle-Localization: plugin
+Export-Package: org.eclipse.sirius.workflow.ui.page;version="6.0.0"
+Bundle-Activator: org.eclipse.sirius.workflow.ui.page.WorkflowPagePlugin$Implementation
+Import-Package: org.eclipse.sirius.ext.base;version="2.1.0",
+ org.eclipse.sirius.workflow.services.api;version="6.0.0"
+Automatic-Module-Name: org.eclipse.sirius.workflow.ui.page
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/about.html b/plugins/org.eclipse.sirius.workflow.ui.page/about.html
new file mode 100644
index 0000000000..420ad0f930
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/about.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<!-- saved from url=(0043)http://www.eclipse.org/legal/epl/about.html -->
+<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+
+<title>About</title>
+</head>
+<body lang="EN-US">
+<h2>About This Content</h2>
+ 
+<p>June 5, 2006</p>	
+<h3>License</h3>
+
+<p>The Eclipse Foundation makes available all content in this plug-in ("Content").  Unless otherwise 
+indicated below, the Content is provided to you under the terms and conditions of the
+Eclipse Public License Version 1.0 ("EPL").  A copy of the EPL is available 
+at <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a>.
+For purposes of the EPL, "Program" will mean the Content.</p>
+
+<p>If you did not receive this Content directly from the Eclipse Foundation, the Content is 
+being redistributed by another party ("Redistributor") and different terms and conditions may
+apply to your use of any object code in the Content.  Check the Redistributor's license that was 
+provided with the Content.  If no such license exists, contact the Redistributor.  Unless otherwise
+indicated below, the terms and conditions of the EPL still apply to any source code in the Content
+and such source code may be obtained at <a href="http://www.eclipse.org/">http://www.eclipse.org</a>.</p>
+
+
+</body></html>
\ No newline at end of file
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/build.properties b/plugins/org.eclipse.sirius.workflow.ui.page/build.properties
new file mode 100644
index 0000000000..536522a34f
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/build.properties
@@ -0,0 +1,21 @@
+#  Copyright (c) 2018 Obeo.
+#  All rights reserved. This program and the accompanying materials
+#  are made available under the terms of the Eclipse Public License v2.0
+#  which accompanies this distribution, and is available at
+#  https://www.eclipse.org/legal/epl-2.0/
+# 
+#  Contributors:
+#     Obeo - initial API and implementation
+# 
+
+bin.includes = .,\
+               META-INF/,\
+               plugin.xml,\
+               plugin.properties,\
+               about.html
+jars.compile.order = .
+source.. = src/
+output.. = bin/
+javacWarnings.. = none
+javacDefaultEncoding.. = US-ASCII
+javacProjectSettings = true
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/plugin.properties b/plugins/org.eclipse.sirius.workflow.ui.page/plugin.properties
new file mode 100644
index 0000000000..294ec2ec49
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/plugin.properties
@@ -0,0 +1,16 @@
+# ====================================================================
+# Copyright (c) 2018 Obeo
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+#
+# Contributors:
+#    Obeo - initial API and implementation
+# ====================================================================
+
+pluginName = Workflow Page Provider for Aird Editor
+providerName = Eclipse Modeling Project
+
+WorkflowPage_tab_name=Workflow
+WorkflowPage_header_title=Workflow of {0}
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/plugin.xml b/plugins/org.eclipse.sirius.workflow.ui.page/plugin.xml
new file mode 100644
index 0000000000..d1fc895c09
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/plugin.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?eclipse version="3.0"?>
+<plugin>
+   <extension point="org.eclipse.sirius.ui.editor.sessionEditorPageProvider">
+      <pageProvider class="org.eclipse.sirius.workflow.ui.page.WorkflowPageProvider" />
+   </extension>
+</plugin>
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/Messages.java b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/Messages.java
new file mode 100644
index 0000000000..ede317121d
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/Messages.java
@@ -0,0 +1,33 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.ui.page;
+
+import org.eclipse.sirius.ext.base.I18N;
+import org.eclipse.sirius.ext.base.I18N.TranslatableMessage;
+
+/**
+ * Translatable messages used in this plug-in.
+ * 
+ * @author pcdavid
+ *
+ */
+public class Messages {
+    static {
+        I18N.initializeMessages(Messages.class, WorkflowPagePlugin.INSTANCE);
+    }
+    
+    @TranslatableMessage
+    public static String WorkflowPage_tab_name;
+    
+    @TranslatableMessage
+    public static String WorkflowPage_header_title;
+
+}
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPage.java b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPage.java
new file mode 100644
index 0000000000..130aa01e4d
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPage.java
@@ -0,0 +1,126 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.ui.page;
+
+import java.net.InetSocketAddress;
+import java.text.MessageFormat;
+import java.util.Objects;
+import java.util.Optional;
+
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.transaction.ResourceSetChangeEvent;
+import org.eclipse.jface.layout.GridLayoutFactory;
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.server.internal.SiriusServerPlugin;
+import org.eclipse.sirius.ui.editor.SessionEditorPlugin;
+import org.eclipse.sirius.ui.editor.api.pages.AbstractSessionEditorPage;
+import org.eclipse.sirius.ui.editor.api.pages.PageProviderRegistry.PositioningKind;
+import org.eclipse.sirius.ui.editor.api.pages.PageUpdateCommandBuilder.PageUpdateCommand;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.browser.Browser;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.ui.forms.IManagedForm;
+import org.eclipse.ui.forms.widgets.FormToolkit;
+import org.eclipse.ui.forms.widgets.ScrolledForm;
+
+/**
+ * A page in the session editor that displays the workflow configured for a session and allows the user to trigger the
+ * corresponding actions.
+ * <p>
+ * The implementations is based on a web application; the page simply embed a {@link Browser} component and points it to
+ * the URI of the application.
+ * 
+ * @author pcdavid
+ */
+public class WorkflowPage extends AbstractSessionEditorPage {
+    /**
+     * The session.
+     */
+    private final Session session;
+
+    /**
+     * The browser component used to display the workflow web application.
+     */
+    private Browser browser;
+
+    /**
+     * Creates a new {@link WorkflowPage} for the specified session.
+     * 
+     * @param s
+     *            the session.
+     */
+    public WorkflowPage(Session s) {
+        super(s.getID(), Messages.WorkflowPage_tab_name);
+        this.session = Objects.requireNonNull(s);
+    }
+
+    @Override
+    protected void createFormContent(IManagedForm managedForm) {
+        super.createFormContent(managedForm);
+        FormToolkit toolkit = managedForm.getToolkit();
+        ScrolledForm scrolledForm = managedForm.getForm();
+        scrolledForm.setText(MessageFormat.format(Messages.WorkflowPage_header_title, session.getID()));
+        toolkit.decorateFormHeading(scrolledForm.getForm());
+
+        Composite body = managedForm.getForm().getBody();
+        body.setLayout(GridLayoutFactory.swtDefaults().create());
+
+        Composite subBody = toolkit.createComposite(body);
+        subBody.setLayout(GridLayoutFactory.swtDefaults().numColumns(2).equalWidth(false).margins(0, 0).create());
+        subBody.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
+        browser = new Browser(subBody, SWT.WEBKIT | SWT.FILL);
+        GridData browserGridData = new GridData(SWT.FILL, SWT.FILL, true, true);
+        browserGridData.widthHint = 0;
+        browserGridData.heightHint = 0;
+        browser.setLayoutData(browserGridData);
+        browser.setUrl(getRootURL(this.session));
+    }
+
+    private String getRootURL(Session session) {
+        URI uri = session.getSessionResource().getURI();
+        if (uri.isPlatformResource()) {
+            @SuppressWarnings("restriction")
+            InetSocketAddress addr = SiriusServerPlugin.getPlugin().getServerAddress();
+            // Use this URL when using the frontend in dev mode.
+            //return "http://localhost:3000/projects/" + uri.segment(1); //$NON-NLS-1$
+            return String.format("http://%s:%d/projects/%s", addr.getHostString(),addr.getPort(), uri.segment(1)); //$NON-NLS-1$
+        } else {
+            return "http://localhost:8080/"; //$NON-NLS-1$
+        }
+    }
+
+    @Override
+    public Optional<String> getLocationId() {
+        return Optional.of(SessionEditorPlugin.DEFAULT_PAGE_ID);
+    }
+
+    @Override
+    public Optional<PositioningKind> getPositioning() {
+        return Optional.of(PositioningKind.AFTER);
+    }
+
+    @Override
+    public Optional<PageUpdateCommand> pageChanged(boolean isVisible) {
+        return Optional.empty();
+    }
+
+    @Override
+    public Optional<PageUpdateCommand> resourceSetChanged(ResourceSetChangeEvent resourceSetChangeEvent) {
+        Display.getDefault().asyncExec(() -> {
+            if (browser != null && !browser.isDisposed()) {
+                browser.refresh();
+            }
+        });
+        return Optional.empty();
+    }
+}
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPagePlugin.java b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPagePlugin.java
new file mode 100644
index 0000000000..d609a175e7
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPagePlugin.java
@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.ui.page;
+
+import org.eclipse.emf.common.EMFPlugin;
+import org.eclipse.emf.common.util.ResourceLocator;
+import org.osgi.framework.BundleContext;
+
+public class WorkflowPagePlugin extends EMFPlugin {
+    /**
+     * The identifier of the plugin.
+     */
+    public static final String PLUGIN_ID = "org.eclipse.sirius.workflow.ui.page"; //$NON-NLS-1$
+
+    /**
+     * The sole instance of the plugin.
+     */
+    public static final WorkflowPagePlugin INSTANCE = new WorkflowPagePlugin();
+
+    /**
+     * The sole instance of the bundle activator.
+     */
+    private static Implementation plugin;
+
+    /**
+     * The constructor.
+     */
+    public WorkflowPagePlugin() {
+        super(new ResourceLocator[0]);
+    }
+
+    @Override
+    public ResourceLocator getPluginResourceLocator() {
+        return plugin;
+    }
+
+    /**
+     * Returns the singleton instance of the Eclipse plugin.
+     *
+     * @return the singleton instance.
+     */
+    public static Implementation getPlugin() {
+        return plugin;
+    }
+
+    /**
+     * The bundle activator.
+     *
+     * @author sbegaudeau
+     */
+    public static class Implementation extends EclipsePlugin {
+
+        /**
+         * The constructor.
+         */
+        public Implementation() {
+            super();
+            WorkflowPagePlugin.plugin = this;
+        }
+
+        @Override
+        public void start(BundleContext context) throws Exception {
+            super.start(context);
+        }
+
+        @Override
+        public void stop(BundleContext context) throws Exception {
+            super.stop(context);
+        }
+    }
+}
diff --git a/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPageProvider.java b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPageProvider.java
new file mode 100644
index 0000000000..200f97570f
--- /dev/null
+++ b/plugins/org.eclipse.sirius.workflow.ui.page/src/org/eclipse/sirius/workflow/ui/page/WorkflowPageProvider.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.sirius.workflow.ui.page;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.business.api.session.SessionManager;
+import org.eclipse.sirius.ui.editor.SessionEditor;
+import org.eclipse.sirius.ui.editor.api.pages.AbstractSessionEditorPage;
+import org.eclipse.sirius.ui.editor.api.pages.PageProvider;
+
+/**
+ * Provides a {@link WorkflowPage} for the session editor.
+ * 
+ * @author pcdavid
+ */
+public class WorkflowPageProvider extends PageProvider {
+    /**
+     * Prefix used to identify the pages.
+     */
+    private static final String PREFIX = "org.eclipse.sirius.workflow:"; //$NON-NLS-1$
+
+    @Override
+    public Map<String, Supplier<AbstractSessionEditorPage>> getPages(SessionEditor editor) {
+        Session s = editor.getSession();
+        Map<String, Supplier<AbstractSessionEditorPage>> result = new HashMap<>();
+        result.put(PREFIX + s.getID(), () -> new WorkflowPage(s));
+        return result;
+    }
+
+    @Override
+    public boolean provides(String pageId) {
+        if (pageId.startsWith(PREFIX)) {
+            String sid = pageId.substring(PREFIX.length());
+            return SessionManager.INSTANCE.getSessions().stream().anyMatch(s -> s.getID().equals(sid));
+        }
+        return false;
+    }
+}