class_docstr: Class to encapsulate the schema information for a heterogeneous graph.
  
  Typically this should be created from a StellarGraph object, using the
  :func:`~stellargraph.core.graph.create_graph_schema` method.
class_docstr_tok: ["Class","to","encapsulate","the","schema","information","for","a","heterogeneous","graph",".","Typically","this","should","be","created","from","a","StellarGraph","object",",","using","the",":","func",":","`","~stellargraph.core.graph.create_graph_schema","`","method","."]
code: def is_directed(self):
      return self._is_directed
  
file_path: stellargraph/stellargraph/core/schema.py
imports: import queue
  import warnings
  from collections.__init__ import namedtuple
  from ..core.utils import is_real_iterable
label_desc: Use image node_id 3 for calling the GraphSchema obj's underlying member method code with example usage: obj.is_directed() and returns: self