code: def get_data(self, name):
          r
          if self._validate_node_name(name):
              raise RuntimeError("Argument `name` is not valid")
          self._node_in_tree(name)
          return self._db[name]["data"]
docs: r"""
          Get the data associated with a node.
  
          :param name: Node name
          :type  name: :ref:`NodeName`
  
          :rtype: any type or list of objects of any type
  
          :raises:
           * RuntimeError (Argument \`name\` is not valid)
  
           * RuntimeError (Node *[name]* not in tree)