}
// Copy all node references
NodeReferencesId refsId = new NodeReferencesId(sourceNode.getNodeId());
if (source.exists(refsId)) {
changes.modified(source.load(refsId));
} else if (target.exists(refsId)) {
NodeReferences references = target.load(refsId);
references.clearAllReferences();
changes.modified(references);
}