code: def build_data_output(cls, name='output', copy_input=None, schema=None):
          
          return cls(name, PortDirection.OUTPUT, type=PortType.DATA, copy_input=copy_input, schema=schema)
docs: Build a data output port.
  
          :param name: port name
          :type name: str
          :return: port object
          :param copy_input: input name where the schema is copied from.
          :type copy_input: str
          :param schema: k1:v1,k2:v2 string describing the schema to be appended
          :type schema: str
          :rtype: PortDef