code: def start_node(self):
          
          return db.cypher_query("MATCH (aNode) "
                                 "WHERE id(aNode)={nodeid} "
                                 "RETURN aNode".format(nodeid=self._start_node_id),
                                 resolve_objects = True)[0][0][0]
docs: Get start node
  
          :return: StructuredNode