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diff --git a/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.sequence/custom-src/org/eclipse/papyrus/uml/diagram/sequence/anchors/AnchorConstants.java b/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.sequence/custom-src/org/eclipse/papyrus/uml/diagram/sequence/anchors/AnchorConstants.java
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+++ b/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.sequence/custom-src/org/eclipse/papyrus/uml/diagram/sequence/anchors/AnchorConstants.java
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+/*****************************************************************************
+ * Copyright (c) 2018 CEA LIST, EclipseSource and others.
+ *
+ * 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:
+ *   EclipseSource - Initial API and implementation
+ *
+ *****************************************************************************/
+package org.eclipse.papyrus.uml.diagram.sequence.anchors;
+
+import org.eclipse.draw2d.IFigure;
+import org.eclipse.uml2.uml.DestructionOccurrenceSpecification;
+import org.eclipse.uml2.uml.ExecutionSpecification;
+import org.eclipse.uml2.uml.Message;
+
+/**
+ * Constants class for Anchors
+ */
+public final class AnchorConstants {
+	private AnchorConstants() {
+		// Constants class; no instance
+	}
+
+	/**
+	 * <p>
+	 * The Anchor Terminal for an Anchor at the start/beginning of an element.
+	 * </p>
+	 *
+	 * <p>
+	 * This anchor represents a single point (Which depends on the anchorage {@link IFigure}), without any parameter.
+	 * </p>
+	 *
+	 * <p>
+	 * This anchor may represent, for example, the start of an {@link ExecutionSpecification}, or the source Send Event of a {@link Message}
+	 * </p>
+	 */
+	public static final String START_TERMINAL = "start";
+
+	/**
+	 * <p>
+	 * The Anchor Terminal for an Anchor at the finish/end of an element.
+	 * </p>
+	 *
+	 * <p>
+	 * This anchor represents a single point (Which depends on the anchorage {@link IFigure}), without any parameter.
+	 * </p>
+	 *
+	 * <p>
+	 * This anchor may represent, for example, the finish of an {@link ExecutionSpecification}, or the target Receive Event of a {@link Message}
+	 * </p>
+	 */
+	public static final String END_TERMINAL = "end";
+
+	/**
+	 * <p>
+	 * The Anchor Terminal for an Anchor at the center of an element.
+	 * </p>
+	 *
+	 * <p>
+	 * This anchor represents a single point (Which depends on the anchorage {@link IFigure}), without any parameter.
+	 * </p>
+	 *
+	 * <p>
+	 * This anchor typically represents the center of the X in a {@link DestructionOccurrenceSpecification}
+	 * </p>
+	 */
+	public static final String CENTER_TERMINAL = "center";
+}