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diff --git a/bundles/org.simantics.browsing.ui/src/org/simantics/browsing/ui/SelectionFilter.java b/bundles/org.simantics.browsing.ui/src/org/simantics/browsing/ui/SelectionFilter.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.browsing.ui;
+
+/**
+ * A SelectionFilter gives a {@link GraphExplorer} client primitive control over
+ * what objects the explorer puts into the selections it provides.
+ * 
+ * <p>
+ * Normally, a {@link GraphExplorer} selection contains only {@link NodeContext}
+ * instances which exist separately for each separate visible UI element, like a
+ * tree node. Presenting an implementation of this interface to an explorer will
+ * cause the explorer to filter its selected NodeContexts, one by one, through
+ * this interface.
+ * 
+ * @author Tuukka Lehtonen
+ * 
+ * @see GraphExplorer#setSelectionFilter(SelectionFilter)
+ */
+public interface SelectionFilter {
+
+    /**
+     * @param context the context to filter
+     * @return the filtered object
+     */
+    Object filter(NodeContext context);
+
+}