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diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/MutableVariant.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/MutableVariant.java
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index 000000000..0d6b6f1e7
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+++ b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/mutable/MutableVariant.java
@@ -0,0 +1,148 @@
+/*******************************************************************************
+ *  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.io.IOException;
+import java.io.InputStream;
+import java.io.InvalidObjectException;
+import java.io.ObjectStreamException;
+import java.io.Serializable;
+
+import org.simantics.databoard.Accessors;
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.accessor.error.AccessorConstructionException;
+import org.simantics.databoard.accessor.error.AccessorException;
+import org.simantics.databoard.accessor.java.JavaObject;
+import org.simantics.databoard.accessor.reference.ChildReference;
+import org.simantics.databoard.adapter.AdaptException;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.binding.reflection.VoidBinding;
+import org.simantics.databoard.type.Datatype;
+
+/**
+ * MutableVariant is a container to a data value of any type. 
+ * The value and type can be changed. 
+ *
+ * MutableVariant is hash-equals-comparable, even variants of bindings (and types). 
+ * The hash function and comparison rules are defined in the manual.   
+ *
+ * @see MutableVariantBinding is binding for Variant-class
+ * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
+ */
+public class MutableVariant extends Variant implements Serializable, Cloneable {
+	
+	private static final long serialVersionUID = 1L;
+	
+	public static MutableVariant ofInstance(Object instance) {
+		Binding binding = Bindings.getBindingUnchecked( instance.getClass() );
+		return new MutableVariant(binding, instance);
+	}
+	
+	/**
+	 * Constract a variant with a default value of empty record {}
+	 */
+	public MutableVariant() {
+		binding = VoidBinding.VOID_BINDING;
+		value = null;
+	}
+	
+	public MutableVariant(Variant v) {
+//		assert(isValid(binding, value));
+		this.binding = v.getBinding();
+		this.value = v.getValue();
+	}	
+	
+	public MutableVariant(Binding binding, Object value) {
+//		assert(isValid(binding, value));
+		this.binding = binding;
+		this.value = value;
+	}
+	
+	/**
+	 * Set value and binding from a variant. This method takes the references, 
+	 * and does not clone the value.
+	 * 
+	 * @param v source variant
+	 */
+	public void setValue(Variant v) {
+		this.binding = v.getBinding();
+		this.value = v.getValue();
+	}
+	
+	public void setValue(Binding binding, Object newValue) {
+//		assert(isValid(binding, newValue));
+		this.binding = binding;
+		this.value = newValue;
+	}
+	
+	public void readFrom(Binding binding, Object newValue) throws BindingException {
+		if (binding.isImmutable()) {
+			this.binding = binding;
+			this.value = newValue;
+			return;
+		}
+				
+		if (this.binding == binding) {
+			binding.readFrom(binding, newValue, this.value);
+		} else {
+			try {
+				this.value = binding.clone( newValue );
+				this.binding = binding;
+			} catch (AdaptException e) {
+				throw new BindingException( e );
+			}
+		}
+	}
+
+	public MutableVariant clone() {
+		if (binding.isImmutable()) return new MutableVariant(binding, value);
+		Object newValue = Bindings.cloneUnchecked(value, binding, binding);
+		return new MutableVariant(binding, newValue);
+	}
+	
+	private void writeObject(java.io.ObjectOutputStream out) throws IOException {
+		Binding dataTypeBinding = Bindings.getBindingUnchecked( Datatype.class );
+		Bindings.getSerializerUnchecked( dataTypeBinding ).serialize(type());
+		Bindings.getSerializerUnchecked( binding ).serialize(value, out);
+	}
+	
+	private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
+		Binding dataTypeBinding = Bindings.getBindingUnchecked( Datatype.class );
+		Datatype type = (Datatype) Bindings.getSerializerUnchecked( dataTypeBinding ).deserialize((InputStream)in);
+		Binding binding = Bindings.getMutableBinding(type);
+		Object value = Bindings.getSerializerUnchecked( binding ).deserialize((InputStream)in);
+		this.binding = binding;
+		this.value = value;
+	}
+	
+	@SuppressWarnings("unused")
+	private void readObjectNoData() throws ObjectStreamException {
+		throw new InvalidObjectException("Don't know how to instantiate "+type()+" with no data");		
+	}
+	
+	public MutableVariant getComponent(ChildReference ref) throws AccessorConstructionException {
+		if ( ref == null ) return this;
+		JavaObject jo = (JavaObject) Accessors.getAccessor(this, ref);
+		return new MutableVariant( jo.getBinding(), jo.getObject() );
+	}
+	
+	public void setComponent(ChildReference ref, Binding binding, Object value) throws AccessorException, AccessorConstructionException {
+        if ( ref == null ) {
+            setValue( binding, value );
+        }
+        else {
+            JavaObject jo = (JavaObject) Accessors.getAccessor(this, ref);
+            jo.setValue( ref, binding, value );
+        }
+	}
+}