Simplify xml_serialize, warn when unknown type used
Simplify xml_serialize, warn when unknown type used

william-richard/moto,william-richard/moto,spulec/moto,william-richard/moto,spulec/moto,spulec/moto,william-richard/moto,william-richard/moto,spulec/moto,spulec/moto,spulec/moto,william-richard/moto