<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def deallocate(self, id_vlan):
 """Deallocate all relationships between Vlan. :param id_vlan: Identifier of the VLAN. Integer value and greater than zero. :return: None :raise InvalidParameterError: VLAN identifier is null and invalid. :raise VlanError: VLAN is active. :raise VlanNaoExisteError: VLAN not found. :raise DataBaseError: Networkapi failed to access the database. :raise XMLError: Networkapi failed to generate the XML response. """


        if not is_valid_int_param(id_vlan):
            raise InvalidParameterError(
                u'The identifier of Vlan is invalid or was not informed.')

        url = 'vlan/' + str(id_vlan) + '/deallocate/'

        code, xml = self.submit(None, 'DELETE', url)

        return self.response(code, xml)