code: def factory_from_graph(cls, data_class, root_args, children):
          
          graph = cls.factory(data_class, **root_args)
          for child in children:
              cls._depth_create(graph.root, child[0], child[1])
  
          return graph
docs: Creates a ``DCCGraph`` and corresponding nodes.  The root_args parm
          is a dictionary specifying the parameters for creating a :class:`Node`
          and its corresponding :class:`BaseNodeData` subclass from the
          data_class specified.  The children parm is an iterable containing
          pairs of dictionaries and iterables, where the dictionaries specify
          the parameters for a :class:`BaseNodeData` subclass and the iterable
          the list of children.
  
          Example::
  
              DCCGraph.factory_from_graph(Label, 
                  {'name':'A'}, [
                      ({'name':'B', []),
                      ({'name':'C', [])
                  ])
  
          creates the graph::
  
                   A
                  / \
                 B   C
  
          :param data_class: 
              django model class that extends :class:`BaseNodeData` and is used
              to associate information with the Nodes in this graph
          :param root_args: 
              dictionary of arguments to pass to constructor of the data class
              instance that is to be created for the root node
          :param children: 
              iterable with a list of dictionary and iterable pairs
          :returns: 
              instance of the newly created ``DCCGraph``