def add_parallel_gateway_to_diagram(self, process_id, gateway_name="<STR_LIT>", gateway_direction="<STR_LIT>",<EOL>node_id=None):
parallel_gateway_id, parallel_gateway = self.add_gateway_to_diagram(process_id,<EOL>consts.Consts.parallel_gateway,<EOL>gateway_name=gateway_name,<EOL>gateway_direction=gateway_direction,<EOL>node_id=node_id)<EOL>return parallel_gateway_id, parallel_gateway<EOL>
Adds an parallelGateway element to BPMN diagram.

:param process_id: string object. ID of parent process,
:param gateway_name: string object. Name of inclusive gateway,
:param gateway_direction: string object. Accepted values - "Unspecified", "Converging", "Diverging", "Mixed".
    Default value - "Unspecified",
:param node_id: string object. ID of node. Default value - None.

:return: a tuple, where first value is parallelGateway ID, second a reference to created object.