def get_string(self):
        if self.is_null():
            raise ValueError
        return "%s.%s" % (self.ver_major, self.ver_minor)
Returns what attributes the SP requires and which are optional
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/api/openstack/api_version_request.py/APIVersionRequest.get_string--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pysaml2-2.4.0/src/saml2/server.py/Server.wants