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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Union.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Union.java
new file mode 100644
index 000000000..2a01e7a0f
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Union.java
@@ -0,0 +1,94 @@
+/*******************************************************************************
+ * 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.utils.datastructures;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+public class Union<T> extends ImmutableCollection<T> {
+    
+    private List<Collection<T>> parts;
+    
+    public Union(int partCount) {
+        parts = new ArrayList<Collection<T>>(partCount);
+    }
+    
+    public void add(Collection<T> part) {
+        parts.add(part);
+    }
+
+    @Override
+    public boolean contains(Object o) {
+        for(Collection<T> part : parts)
+            if(part.contains(o))
+                return true;
+        return false;
+    }
+
+    @Override
+    public boolean containsAll(Collection<?> c) {
+        for(Object o : c)
+            if(!contains(o))
+                return false;
+        return true;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        for(Collection<T> part : parts)
+            if(part.isEmpty())
+                return true;
+        return false;
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+        
+        return new ImmutableIterator<T>() {
+
+            Iterator<Collection<T>> partIterator = parts.iterator();
+            Iterator<T> iterator = null;
+            
+            @Override
+            public boolean hasNext() {
+                while(iterator == null || !iterator.hasNext()) {
+                    if(!partIterator.hasNext())
+                        return false;
+                    iterator = partIterator.next().iterator();
+                }
+                return true;
+            }
+
+            @Override
+            public T next() {
+                if(hasNext()) 
+                    return iterator.next();
+                else
+                    throw new NoSuchElementException();
+            }
+            
+        };
+        
+    }
+
+    @Override
+    public int size() {
+        int count = 0;
+        for(Collection<T> part : parts)
+            count += part.size();
+        return count;
+    }
+
+}