<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def build_data_output(cls, name='output', copy_input=None, schema=None):
 """ 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 """

        return cls(name, PortDirection.OUTPUT, type=PortType.DATA, copy_input=copy_input, schema=schema)