code: def _create_interface_specification(schema_graph, graphql_types, hidden_classes, cls_name):
      
      def interface_spec():
          """Return a list of GraphQL interface types implemented by the type named 'cls_name'."""
          abstract_inheritance_set = (
              superclass_name
              for superclass_name in sorted(list(schema_graph.get_inheritance_set(cls_name)))
              if (superclass_name not in hidden_classes and
                  schema_graph.get_element_by_class_name(superclass_name).abstract)
          )
  
          return [
              graphql_types[x]
              for x in abstract_inheritance_set
              if x not in hidden_classes
          ]
  
      return interface_spec
docs: Return a function that specifies the interfaces implemented by the given type.