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diff --git a/bundles/org.simantics.scenegraph.profile/src/org/simantics/scenegraph/profile/Style.java b/bundles/org.simantics.scenegraph.profile/src/org/simantics/scenegraph/profile/Style.java
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+++ b/bundles/org.simantics.scenegraph.profile/src/org/simantics/scenegraph/profile/Style.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.scenegraph.profile;
+
+import org.simantics.db.RequestProcessor;
+import org.simantics.db.Resource;
+
+/**
+ * This interface is not intended to be implemented directly. Extend
+ * {@link StyleBase} instead.
+ * 
+ * @see StyleBase
+ * @author Antti Villberg
+ */
+public interface Style {
+
+    /**
+     * Activates this style. Intended to start tracking the diagram items
+     * contained by the specified group and to request style applications
+     * whenever necessary through the specified profile observer. If a style
+     * instance is already active, re-activation should not do anything. A style
+     * can be re-activated after being deactivated.
+     * 
+     * @param backend
+     * @param runtimeDiagram
+     * @param configuration
+     * @param group
+     * @param observer
+     */
+    void activate(RequestProcessor backend, Resource runtimeDiagram, Resource entry, Group group, EvaluationContext observer);
+
+    /**
+     * Deactivates this style. Intended to stop tracking the currently tracked
+     * group of diagram items and clean the diagram scene graph up by
+     * removing/disabling all scene graph contributions produced by this style.
+     * Deactivating an inactive style does nothing.
+     * 
+     * @param backend
+     * @param runtimeDiagram
+     * @param configuration
+     * @param group
+     * @param observer
+     */
+    void deactivate(Resource runtimeDiagram, Resource entry, Group group, EvaluationContext observer);
+
+    /**
+     * Perform complete re-application of this style on the current set of
+     * observed diagram items.
+     * 
+     * <p>
+     * Must always be invoked from the canvas context thread.
+     * 
+     * @param context the canvas context in which the style is to be applied
+     * @param diagram
+     * @param group
+     * @param observer profile system observer for this canvas context
+     */
+    void apply(Resource entry, Group group, EvaluationContext observer);
+
+}