removing '_' for function definition and calls: _nodeModelToNodeGraph -> nodeModelToNodeGraph _addRelationship -> addRelationship _deleteRelationship -> deleteRelationship _removeTopic -> removeTopic --HG-- branch : clean-up
removing '_' for function definition and calls: _nodeModelToNodeGraph -> nodeModelToNodeGraph _addRelationship -> addRelationship _deleteRelationship -> deleteRelationship _removeTopic -> removeTopic --HG-- branch : clean-up