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diff --git a/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/ChildContribution.java b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/ChildContribution.java
new file mode 100644
index 000000000..76aa59392
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+++ b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/ChildContribution.java
@@ -0,0 +1,167 @@
+/*******************************************************************************
+ * 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.children;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.model.InvalidContribution;
+import org.simantics.browsing.ui.model.nodetypes.NodeType;
+import org.simantics.databoard.Bindings;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.utils.NameUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.exception.PendingVariableException;
+import org.simantics.viewpoint.ontology.ViewpointResource;
+
+/**
+ * A child contribution adds child nodes to the instances of a specific node type.
+ * @author Hannu Niemistö
+ */
+public class ChildContribution {
+	
+	double priority;
+	String identifier;
+    NodeType parentNodeType;
+    NodeType childNodeType;
+    ChildRule childRule;
+        
+    public ChildContribution(String identifier, double priority, NodeType parentNodeType, NodeType childNodeType,
+            ChildRule childRule) throws InvalidContribution {
+        if(!childRule.isCompatible(
+                parentNodeType.getContentType()
+                ))
+            throw new InvalidContribution("Child rule is not compatible with the parent content type.");
+        this.parentNodeType = parentNodeType;
+        this.childNodeType = childNodeType;
+        this.childRule = childRule;
+        this.identifier = identifier;
+        this.priority = priority;
+    }
+
+    public static ChildContribution create(ReadGraph g, Resource childContributionResource) throws DatabaseException, InvalidContribution {
+        ViewpointResource vr = ViewpointResource.getInstance(g);
+        
+        Resource parentNodeTypeResource = g.getSingleObject(childContributionResource, vr.ChildContribution_HasParentNodeType);
+        NodeType parentNodeType = g.adapt(parentNodeTypeResource, NodeType.class);
+        
+        Resource childNodeTypeResource = g.getSingleObject(childContributionResource, vr.ChildContribution_HasChildNodeType);
+        NodeType childNodeType = g.adapt(childNodeTypeResource, NodeType.class);
+        
+        Resource childRuleResource = g.getSingleObject(childContributionResource, vr.ChildContribution_HasRule);
+        ChildRule childRule = g.adapt(childRuleResource, ChildRule.class);
+        
+        String identifier = g.getPossibleRelatedValue(childContributionResource, vr.ChildContribution_identifier, Bindings.STRING);
+        if(identifier == null) identifier = "";
+        if("".equals(identifier)) {
+        	identifier = g.getPossibleURI(childContributionResource);
+            if(identifier == null) identifier = NameUtils.getSafeName(g, childContributionResource, true);
+        }
+        
+        Double priority = g.getPossibleRelatedValue(childContributionResource, vr.ChildContribution_priority, Bindings.DOUBLE);
+        if(priority == null) priority = 0.0;
+        
+        return new ChildContribution(identifier, priority, parentNodeType, childNodeType, childRule);
+        
+    }
+
+    public NodeType getParentNodeType() {
+        return parentNodeType;
+    }
+    
+    public NodeType getChildNodeType() {
+        return childNodeType;
+    }
+    
+    public String getIdentifier() {
+    	return identifier;
+    }
+
+    public double getPriority() {
+    	return priority;
+    }
+    
+    /**
+     * Given a parent node context returns a child node contexts contributed by
+     * this contribution.
+     */
+    public Collection<NodeContext> getChildren(ReadGraph graph, NodeContext parent) {
+        try {
+            Object parentContent = parent.getConstant(BuiltinKeys.INPUT);
+            Collection<?> childContents = childRule.getChildren(graph, parentContent);
+            if(childContents.isEmpty())
+                return Collections.emptyList();
+            ArrayList<NodeContext> children = new ArrayList<NodeContext>(childContents.size());
+            for(Object childContent : childContents) {
+                NodeContext child = childNodeType.createNodeContext(graph, childContent);
+                if(child != null)
+                    children.add(child);
+            }
+            return children;
+        } catch(PendingVariableException e) {
+            return Collections.emptyList();
+        } catch(DatabaseException e) {
+            e.printStackTrace();
+            // TODO return some kind of error node
+            return Collections.emptyList();
+        }
+    }
+    
+    /**
+     * Given a child node context returns a collection of possible parent node contexts.
+     */
+    public Collection<NodeContext> getParents(ReadGraph graph, NodeContext child) {
+        try {
+            Object childContent = child.getConstant(BuiltinKeys.INPUT);
+            Collection<?> parentContents = childRule.getParents(graph, childContent);
+            if(parentContents.isEmpty())
+                return Collections.emptyList();
+            ArrayList<NodeContext> parents = new ArrayList<NodeContext>(parentContents.size());
+            for(Object parentContent : parentContents) {
+                NodeContext parent = parentNodeType.createNodeContext(graph, parentContent);
+                if(parent != null)
+                    parents.add(parent);
+            }
+            return parents;
+        } catch(DatabaseException e) {
+            e.printStackTrace();
+            return Collections.emptyList();
+        }
+    }
+
+    public boolean hasChildren(ReadGraph graph, NodeContext parent) {
+        try {
+            Object parentContent = parent.getConstant(BuiltinKeys.INPUT);
+            Collection<?> childContents = childRule.getChildren(graph, parentContent);
+            if(childContents.isEmpty())
+                return false;
+            for(Object childContent : childContents) {
+                NodeContext child = childNodeType.createNodeContext(graph, childContent);
+                if(child != null)
+                    return true;
+            }
+        } catch(DatabaseException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+    
+    @Override
+    public String toString() {
+    	return identifier;
+    }
+    
+}