def getSubgraphList(self, parent_name):
if not self.isMultigraph:<EOL><INDENT>raise AttributeError("<STR_LIT>")<EOL><DEDENT>if parent_name in self._graphDict:<EOL><INDENT>return self._subgraphNames[parent_name] or []<EOL><DEDENT>else:<EOL><INDENT>raise AttributeError("<STR_LIT>"<EOL>% (parent_name,))<EOL><DEDENT>
Returns list of names of subgraphs for Root Graph with name parent_name.

        @param parent_name: Name of Root Graph.
        @return:            List of subgraph names.