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diff --git a/plugins/infra/ui/org.eclipse.papyrus.infra.widgets/src/org/eclipse/papyrus/infra/widgets/providers/IGraphicalContentProvider.java b/plugins/infra/ui/org.eclipse.papyrus.infra.widgets/src/org/eclipse/papyrus/infra/widgets/providers/IGraphicalContentProvider.java
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+++ b/plugins/infra/ui/org.eclipse.papyrus.infra.widgets/src/org/eclipse/papyrus/infra/widgets/providers/IGraphicalContentProvider.java
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+/*****************************************************************************
+ * Copyright (c) 2011 CEA LIST.
+ *
+ * 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:
+ *  Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
+ *****************************************************************************/
+package org.eclipse.papyrus.infra.widgets.providers;
+
+import org.eclipse.jface.viewers.IContentProvider;
+import org.eclipse.swt.widgets.Composite;
+
+/**
+ * An interface for implementing a ContentProvider which requires
+ * graphical elements for features such as filters.
+ *
+ * @author Camille Letavernier
+ *
+ */
+public interface IGraphicalContentProvider extends IContentProvider {
+
+	/**
+	 * Create graphical elements, which will appear before the widget
+	 * used to display the provided elements
+	 *
+	 * @param parent
+	 */
+	public abstract void createBefore(Composite parent);
+
+	/**
+	 * Create graphical elements, which will appear after the widget
+	 * used to display the provided elements
+	 *
+	 * @param parent
+	 */
+	public abstract void createAfter(Composite parent);
+}