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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/processors/ShowMaxChildrenProcessor.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/processors/ShowMaxChildrenProcessor.java
new file mode 100644
index 000000000..ea0042923
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+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/processors/ShowMaxChildrenProcessor.java
@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * 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.common.processors;
+
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryProcessor;
+
+/**
+ * A primitive query processor (see {@link PrimitiveQueryProcessor}) interface
+ * for externally controlling the results of
+ * {@link BuiltinKeys#SHOW_MAX_CHILDREN} queries.
+ * 
+ * @author Tuukka Lehtonen
+ */
+public interface ShowMaxChildrenProcessor {
+
+    /**
+     * Set internal processor showAllChildren status without notifying the graph
+     * explorer query cache of changes.
+     * 
+     * @param context the context to mark
+     * @param maxChildren the new max child count or 0 to make this processor
+     *        return <code>null</code> when queried
+     * @return <code>true</code> if the node's expanded state was changed,
+     *         <code>false</code> otherwise
+     */
+    boolean setShowMaxChildren(NodeContext context, int maxChildren);
+
+    /**
+     * Replace the current processor showAllChildren status and notify the graph
+     * explorer query cache of changes.
+     * 
+     * @param context the context to mark
+     * @param maxChildren the new max child count or 0 to make this processor
+     *        return <code>null</code> when queried
+     * @return <code>true</code> if the node's expanded state was changed,
+     *         <code>false</code> otherwise
+     */
+    boolean replaceShowMaxChildren(NodeContext context, int maxChildren);
+
+}