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diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/impl/DefaultSetBinding.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/impl/DefaultSetBinding.java
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+/*******************************************************************************
+ *  Copyright (c) 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.databoard.binding.impl;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeSet;
+
+import org.simantics.databoard.binding.ArrayBinding;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.MapBinding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.binding.reflection.VoidBinding;
+import org.simantics.databoard.type.MapType;
+import org.simantics.databoard.type.RecordType;
+
+/**
+ * Binds java.util.Set to Map(T, {})
+ * 
+ * This binding accepts all java.util.Set instances, but instantiates
+ * java.util.TreeSet objects.
+ *
+ * @author Reino Ruusu <reino.ruusu@vtt.fi>
+ */
+@SuppressWarnings("unchecked")
+public class DefaultSetBinding extends MapBinding {
+	
+	public DefaultSetBinding(MapType mapType, Binding elementBinding) {
+		super(mapType, elementBinding, VoidBinding.VOID_BINDING);
+	}
+	
+	public DefaultSetBinding(Binding elementBinding) {
+		super(new MapType(elementBinding.type(), RecordType.VOID_TYPE), elementBinding, VoidBinding.VOID_BINDING);
+	}
+
+	@Override
+	public void clear(Object set) throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		_set.clear();
+	}
+
+	@Override
+	public boolean containsKey(Object set, Object key) throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		return _set.contains(key);
+	}
+
+	@Override
+	public boolean containsValue(Object set, Object value)
+			throws BindingException {
+		return false;
+	}
+
+    @Override
+    public Object create() throws BindingException {
+        return new TreeSet<Object>( keyBinding );
+    }
+
+	public Object create(Set<?> initialSet) throws BindingException {
+	    return initialSet;
+	}
+
+	@Override
+	public Object create(Map<?, ?> initialMap) throws BindingException {
+		Set<Object> result = new TreeSet<Object>( keyBinding );
+		result.addAll(initialMap.keySet());
+		return result;
+	}
+
+	@Override
+	public Object create(Object[] keys, Object[] values)
+	throws BindingException {		
+		Set<Object> result = new TreeSet<Object>( keyBinding );
+		for (int i=0; i<keys.length; i++) {
+			result.add( keys[i] );
+		}
+		return result;
+	}
+	
+	@Override
+	public Object create(List<Object> keys, List<Object> values) {
+		Set<Object> result = new TreeSet<Object>( keyBinding );
+		for (int i=0; i<keys.size(); i++)
+			result.add(keys.get(i));
+		return result;
+	}	
+
+	@Override
+	public Object get(Object set, Object key) throws BindingException {
+		return null;
+	}
+	
+    @Override
+    public <K, V> void getAll(Object setFrom, Map<K, V> to) throws BindingException {
+		Map<K, V> _to = (Map<K, V>) to;
+		Set<K> _setFrom = (Set<K>) setFrom;
+		for (K k : _setFrom)
+			_to.put(k, null);
+	}
+
+	@Override
+	public void getAll(Object setFrom, Object[] keys, Object[] values)
+			throws BindingException {
+		Set<Object> _setFrom = (Set<Object>) setFrom;
+		int i=0;
+		for (Object k : _setFrom) {
+			keys[i] = k;
+			values[i] = null;
+		}		
+	}
+
+	@Override
+	public Object[] getKeys(Object set) throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		return _set.toArray(new Object[_set.size()]);
+	}
+
+	@Override
+	public void getKeys(Object set, Set<Object> keys) throws BindingException {
+		Set<Object> s = (Set<Object>) set;
+		keys.addAll(s);
+	}
+	
+	@Override
+	public Object[] getValues(Object set) throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		return new Object[_set.size()];
+	}
+	
+	@Override
+	public int count(Object src, Object from, boolean fromInclusive, Object end, boolean endInclusive) throws BindingException {
+	    if (src instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).count(src, from, fromInclusive, end, endInclusive);
+	    else
+	        return new HashSetBinding(keyBinding).count(src, from, fromInclusive, end, endInclusive);
+	}
+	
+	@Override
+	public int getEntries(Object src, Object from, boolean fromInclusive, Object end, boolean endInclusive, ArrayBinding dstKeyArrayBinding, Object dstKeyArray, ArrayBinding dstValueArrayBinding, Object dstValueArray, int limit) throws BindingException {
+		return 0;
+	}
+
+	@Override
+	public void put(Object set, Object key, Object value)
+			throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		if (value!=null) throw new BindingException("Cannot put non-null to a Set");
+		_set.add(key);
+	}
+
+	public void putAll(Object setTo, Set<?> from) {
+		Set<Object> _set = (Set<Object>) setTo;
+		_set.addAll(from);
+	}
+	
+	@Override
+	public <K,V> void putAll(Object setTo, Map<K,V> from) throws BindingException {
+		Set<Object> _set = (Set<Object>) setTo;
+		_set.addAll(from.keySet());
+	}
+
+	@Override
+	public Object remove(Object set, Object key) throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		_set.remove(key);
+		return null;
+	}
+
+	@Override
+	public int size(Object set) throws BindingException {
+		Set<Object> _set = (Set<Object>) set;
+		return _set.size();
+	}
+
+	@Override
+	public boolean isInstance(Object obj) {
+		return obj instanceof Set;
+	}
+
+	@Override
+	public Object getCeilingKey(Object set, Object key) {
+        if (set instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).getCeilingKey(set, key);
+        else
+            return new HashSetBinding(keyBinding).getCeilingKey(set, key);
+	}
+
+	@Override
+	public Object getFirstKey(Object set) {
+        if (set instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).getFirstKey(set);
+        else
+            return new HashSetBinding(keyBinding).getFirstKey(set);
+	}
+
+	@Override
+	public Object getFloorKey(Object set, Object key) {
+        if (set instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).getFloorKey(set, key);
+        else
+            return new HashSetBinding(keyBinding).getFloorKey(set, key);
+	}
+
+	@Override
+	public Object getHigherKey(Object set, Object key) {
+        if (set instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).getHigherKey(set, key);
+        else
+            return new HashSetBinding(keyBinding).getHigherKey(set, key);
+	}
+
+	@Override
+	public Object getLastKey(Object set) {
+        if (set instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).getLastKey(set);
+        else
+            return new HashSetBinding(keyBinding).getLastKey(set);
+	}
+
+	@Override
+	public Object getLowerKey(Object set, Object key) {
+        if (set instanceof TreeSet)
+            return new TreeSetBinding(keyBinding).getLowerKey(set, key);
+        else
+            return new HashSetBinding(keyBinding).getLowerKey(set, key);
+	}
+
+}
+