compute/manager.py:
    @exception.wrap_exception
    def query_domain_descriptor(self, context, instance_id):
        return '<a>123</a>'

compute/api.py:
    def query_domain_descriptor(self, context, instance_id):
        res = self._call_compute_message("query_domain_descriptor", context, instance_id)
        logging.warn(res)
        return res