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diff --git a/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/nodetypes/NodeType.java b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/nodetypes/NodeType.java
new file mode 100644
index 000000000..9ee9eec4d
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+++ b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/nodetypes/NodeType.java
@@ -0,0 +1,76 @@
+/*******************************************************************************
+ * Copyright (c) 2010, 2011 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.browsing.ui.model.nodetypes;
+
+import java.util.Collection;
+
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.NodeContext.ConstantKey;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.ui.selection.WorkbenchSelectionElement;
+
+/**
+ * Node type specifies the content type and role of the node in 
+ * the model browser.
+ * @author Hannu Niemistö
+ */
+public interface NodeType {
+
+    public static class TypeKey implements ConstantKey<NodeType> {
+        private TypeKey() {}
+        @Override
+        public String toString() {
+            return "TYPE";
+        }
+    };
+    public static final ConstantKey<NodeType> TYPE = new TypeKey();
+
+    public static final ConstantKey<?>[] KEY_SEQUENCE = new ConstantKey<?>[] {
+        BuiltinKeys.INPUT,
+        TYPE
+    };
+
+    public static final ConstantKey<?>[] KEY_SEQUENCE_EXT = new ConstantKey<?>[] {
+        BuiltinKeys.INPUT,
+        TYPE,
+        BuiltinKeys.UI_CONTEXT,
+        BuiltinKeys.BROWSE_CONTEXT,
+        BuiltinKeys.ACTION_BROWSE_CONTEXT
+    };
+    
+    /**
+     * Creates a node context from the content. If the content is not
+     * suitable for this node type, returns null. This method cannot
+     * assume anything about the Java type of the content given as
+     * a parameter, but if it returns a node its content must be 
+     * an instance of the Java class given by getContentType.
+     */
+    NodeContext createNodeContext(ReadGraph graph, Object content) throws DatabaseException;
+    
+    /**
+     * Returns the expected Java type of the content.
+     */
+    Class<?> getContentType();
+    
+    /**
+     * Tests if this node type inherits (or is equal to) given node type.
+     */
+    boolean inherits(ReadGraph graph, NodeType superType) throws DatabaseException;
+
+    Collection<NodeType> getSuper(ReadGraph g) throws DatabaseException;
+
+    String toString(ReadGraph graph) throws DatabaseException; 
+    
+    WorkbenchSelectionElement getWorkbenchSelectionElement(NodeContext context);
+}