Repopulate the node-tracking data structures.  Shouldn't
        really ever be needed.

def rebuild(self, **kwargs):
        '''Repopulate the node-tracking data structures.  Shouldn't
        really ever be needed.
        '''
        self.nodes = []
        self.node_types = []
        self.id_dict = {}
        self.type_dict = {}

        self.add_node(self.root)