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diff --git a/bundles/org.simantics.scenegraph.profile/src/org/simantics/scenegraph/profile/Group.java b/bundles/org.simantics.scenegraph.profile/src/org/simantics/scenegraph/profile/Group.java
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+++ b/bundles/org.simantics.scenegraph.profile/src/org/simantics/scenegraph/profile/Group.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * 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.scenegraph.profile;
+
+import org.simantics.db.RequestProcessor;
+import org.simantics.db.Resource;
+import org.simantics.db.procedure.SetListener;
+
+
+/**
+ * Groups are a part of the diagram profile framework. They are used to form and
+ * keep track of the group of objects on which {@link Style}s operate.
+ * 
+ * @author Antti Villberg
+ */
+public interface Group {
+
+    /**
+     * Allows styles to start tracking the set of objects (resources) listed by
+     * this Group implementation through the specified {@link SetListener}.
+     * 
+     * @param processor graph database access handle
+     * @param runtimeDiagram runtime resource of the active diagram editor
+     *        instance
+     * @param configuration variable access to the diagram's mapped
+     *        configuration
+     * @param listener the listener to notify of changes in the tracked set of
+     *        objects. Usually one just delegates normal database listener
+     *        events to this listener.
+     */
+    void trackItems(RequestProcessor processor, Resource runtimeDiagram, SetListener<Resource> listener);
+
+}