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diff --git a/bundles/org.simantics.simulator.variable/src/org/simantics/simulator/variable/impl/AbstractNodeManager.java b/bundles/org.simantics.simulator.variable/src/org/simantics/simulator/variable/impl/AbstractNodeManager.java
new file mode 100644
index 000000000..0eb5fc381
--- /dev/null
+++ b/bundles/org.simantics.simulator.variable/src/org/simantics/simulator/variable/impl/AbstractNodeManager.java
@@ -0,0 +1,167 @@
+/*******************************************************************************
+ * Copyright (c) 2013 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
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.simulator.variable.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.VariantBinding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.binding.mutable.Variant;
+import org.simantics.databoard.type.Datatype;
+import org.simantics.simulator.variable.NodeManager;
+import org.simantics.simulator.variable.exceptions.NoSuchNodeException;
+import org.simantics.simulator.variable.exceptions.NodeManagerException;
+
+/**
+ * AbstractNodeManager gives default implementations to some methods
+ * of NodeManager.
+ * 
+ * @author Hannu Niemistö
+ */
+public abstract class AbstractNodeManager<Node> implements NodeManager<Node> {
+	
+
+    final static Binding NO_BINDING = new VariantBinding() {
+
+        @Override
+        public Object getContent(Object variant, Binding contentBinding) throws BindingException {
+            throw new Error();
+        }
+
+        @Override
+        public Object getContent(Object variant) throws BindingException {
+            throw new Error();
+        }
+
+        @Override
+        public Datatype getContentType(Object variant) throws BindingException {
+            throw new Error();
+        }
+
+        @Override
+        public Binding getContentBinding(Object variant) throws BindingException {
+            throw new Error();
+        }
+
+        @Override
+        public Object create(Binding contentBinding, Object content) throws BindingException {
+            throw new Error();
+        }
+
+        @Override
+        public void setContent(Object variant, Binding contentBinding, Object content) throws BindingException {
+            throw new Error();
+        }
+
+        @Override
+        public boolean isInstance(Object obj) {
+            return true;
+        }
+
+        @Override
+        public void assertInstaceIsValid(Object obj, Set<Object> validInstances) throws BindingException {
+            throw new Error();
+        }
+        
+        @Override
+        public int compare(Object o1, Object o2) throws org.simantics.databoard.binding.error.RuntimeBindingException {
+        	if(o1 == null) {
+        		if(o2 == null) {
+        			return 0;
+        		} else {
+        			return  - System.identityHashCode(o2);
+        		}
+        	} else {
+        		if(o2 == null) {
+        			return  System.identityHashCode(o1);
+        		} else {
+        			if(o1.equals(o2)) return 0;
+        			return System.identityHashCode(o1) - System.identityHashCode(o2);	
+        		}
+        	}
+        }
+
+    };
+    
+	@Override
+	public List<String> getChildNames(Node node) throws NodeManagerException {
+		List<Node> children = getChildren(node);
+		ArrayList<String> names = new ArrayList<String>(children.size());
+		for(Node child : children)
+			names.add(getName(child));
+		return names;
+	}
+	
+	@Override
+	public List<String> getPropertyNames(Node node) throws NodeManagerException {
+		List<Node> properties = getProperties(node);
+		ArrayList<String> names = new ArrayList<String>(properties.size());
+		for(Node property : properties)
+			names.add(getName(property));
+		return names;
+	}
+	
+	@Override
+	public Object getValue(Node node, String propertyName, Binding binding)
+			throws NodeManagerException, BindingException {
+		Node property = getProperty(node, propertyName);
+		if(property == null)
+			throw new NoSuchNodeException("Didn't find a property " + propertyName);
+		return getValue(property, binding);
+	}
+	
+	@Override
+	public void setValue(Node node, String propertyName, Object value,
+			Binding binding) throws NodeManagerException, BindingException {
+		Node property = getProperty(node, propertyName);
+		if(property == null)
+			throw new NoSuchNodeException("Didn't find a property " + propertyName);
+		setValue(property, value, binding);
+	}
+	
+	@Override
+	public Variant getValue(Node node) throws NodeManagerException {
+		Datatype datatype = getDatatype(node);
+		Binding binding = datatype != null ? Bindings.getBinding(datatype) : NO_BINDING;
+		try {
+			Object value = getValue(node, binding);
+			if (value instanceof Variant)
+				return (Variant)value;
+			else
+				return new Variant(binding, value);
+		} catch (BindingException e) {
+			// Shouldn't really happen
+			assert(false);
+			return new Variant();
+		}
+	}
+	
+	@Override
+	public Variant getValue(Node node, String propertyName)
+			throws NodeManagerException {
+		Node property = getProperty(node, propertyName);
+		if(property == null)
+			throw new NoSuchNodeException("Didn't find a property " + propertyName);
+		return getValue(property);
+	}
+	
+    @Override
+    public String getPropertyURI(Node parent, Node property) {
+        return null;
+    }	
+
+}