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diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/SynchronizationHints.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/SynchronizationHints.java
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+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/SynchronizationHints.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * 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:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.synchronization;
+
+import org.simantics.g2d.diagram.IDiagram;
+import org.simantics.g2d.element.IElement;
+import org.simantics.g2d.element.IElementClassProvider;
+import org.simantics.project.IProject;
+import org.simantics.project.ProjectKeys;
+import org.simantics.utils.datastructures.hints.IHintContext;
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
+
+/**
+ * A collection of {@link IHintContext} keys related to graph and diagram
+ * synchronization.
+ * 
+ * @author Tuukka Lehtonen
+ */
+public final class SynchronizationHints {
+
+    /**
+     * A key for associating an {@link ISynchronizationContext} with an
+     * {@link IDiagram}.
+     */
+    public static final Key CONTEXT                = new KeyOf(ISynchronizationContext.class, "SYNCHRONIZATION_CONTEXT");
+
+    /**
+     * A key for associating an {@link IElementClassProvider} with an
+     * {@link ISynchronizationContext}.
+     */
+    public static final Key ELEMENT_CLASS_PROVIDER = new KeyOf(IElementClassProvider.class, "ELEMENT_CLASS_PROVIDER");
+
+    /**
+     * A key for associating an {@link ErrorHandler} with an
+     * {@link ISynchronizationContext}.
+     */
+    public static final Key ERROR_HANDLER          = new KeyOf(ErrorHandler.class, "ERROR_HANDLER");
+
+    /**
+     * A key for associating an {@link IModificationQueue} with an
+     * {@link ISynchronizationContext}.
+     */
+    public static final Key MODIFICATION_QUEUE     = new KeyOf(IModificationQueue.class, "MODIFICATION_QUEUE");
+
+    /**
+     * A key for associating a custom hint synchronizer to an {@link IElement}.
+     */
+    public static final Key HINT_SYNCHRONIZER      = new KeyOf(IHintSynchronizer.class, "HINT_SYNCHRONIZER");
+
+    /**
+     * A key for defining a {@link CopyAdvisor} to be used with a particular
+     * {@link IDiagram}.
+     */
+    public static final Key COPY_ADVISOR           = new KeyOf(CopyAdvisor.class, "COPY_ADVISOR");
+
+    /**
+     * A key for hinting to a {@link CopyAdvisor} that it should not perform
+     * renaming of the copied data.
+     */
+    public static final Key NO_RENAME              = new KeyOf(Boolean.class, "NO_RENAME");
+
+    /**
+     * A key for retrieving the curretly active project (see {@link IProject})
+     * from an {@link ISynchronizationContext}.
+     */
+    public static final Key PROJECT                = ProjectKeys.KEY_PROJECT;
+
+}