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diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/ImmutableVariantBinding.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/ImmutableVariantBinding.java
new file mode 100644
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+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/ImmutableVariantBinding.java
@@ -0,0 +1,117 @@
+/*******************************************************************************
+ *  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.mutable;
+
+import java.util.Set;
+
+import org.simantics.databoard.adapter.AdaptException;
+import org.simantics.databoard.adapter.AdapterFactory;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.VariantBinding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.binding.reflection.ClassBindingFactory;
+import org.simantics.databoard.type.Datatype;
+
+/**
+ * ImmutableVariantBinding binds VariantType to {@link Variant} Class. 
+ */
+public class ImmutableVariantBinding extends VariantBinding {
+		
+	ClassBindingFactory bindingFactory;
+	AdapterFactory adapterFactory;
+	
+	public ImmutableVariantBinding(ClassBindingFactory bindingFactory, AdapterFactory adapterFactory) {
+		this.bindingFactory = bindingFactory;
+		this.adapterFactory = adapterFactory;
+	}
+	
+	@Override
+	public boolean isImmutable() {
+		return true;
+	}
+	
+	@Override
+	public Object create(Binding binding, Object value) throws BindingException {
+		return new Variant(binding, value);
+	}
+	
+	@Override
+	public Binding getContentBinding(Object variant) throws BindingException {
+		Variant result = (Variant) variant;
+		return result.binding;
+	}
+	
+	@Override
+	public Datatype getContentType(Object variant) throws BindingException {
+		Variant result = (Variant) variant;
+		return result.binding.type();
+	}
+	
+	@Override
+	public Object getContent(Object variant, Binding binding) throws BindingException {
+		Variant var = (Variant) variant;
+		try {
+			Binding binding1 = var.binding;
+			Object value1 = var.value;
+			Binding binding2 = binding;
+			Object value2 = adapterFactory.adapt(value1, binding1, binding2);
+			return value2;
+		} catch (AdaptException e) {
+			throw new BindingException(e);
+		}
+	}
+	
+	public Object getContent(Object variant) throws BindingException {
+		Variant var = (Variant) variant;
+		return var.value;
+	}
+
+	@Override
+	public void setContent(Object variant, Binding binding, Object value)
+			throws BindingException {
+		Variant var = (Variant) variant;
+		if (var.binding == binding && var.value==value) return;
+		throw new BindingException("Cannot write to immutable variant");
+	}
+
+	@Override
+	public void assertInstaceIsValid(Object obj, Set<Object> validInstances) throws BindingException {
+		if (obj==null) throw new BindingException("null value is not Variant");
+		if (obj instanceof Variant == false) throw new BindingException("wrong class, Variant expected");
+		Variant var = (Variant) obj;
+		if (var.binding==null) throw new BindingException("Binding is expected");		
+		var.binding.assertInstaceIsValid(var.value, validInstances);
+	}
+
+	@Override
+	public boolean isInstance(Object obj) {
+		if (obj==null) return false;
+		if (obj instanceof Variant == false) return false;
+		return true;
+	}
+	
+	boolean isValid(Binding binding, Object obj) throws BindingException {
+		binding.assertInstaceIsValid(obj);
+		return true;
+	}
+
+	@Override
+	public int baseHashCode() {
+	    return super.baseHashCode() + 7 * adapterFactory.hashCode() + 13 * bindingFactory.hashCode(); 
+	}
+	
+	@Override
+	protected boolean baseEquals(Object obj) {
+		ImmutableVariantBinding o = (ImmutableVariantBinding)obj;
+		return super.baseEquals(obj) && o.adapterFactory == adapterFactory && o.bindingFactory == bindingFactory;
+	}
+}