<xs:simpleType name="IdentificationType" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:restriction base="xs:string"> <xs:enumeration value="SSN" /> <xs:enumeration value="passport" /> <xs:enumeration value="driverslicense" /> <xs:enumeration value="idcard" /> </xs:restriction> </xs:simpleType>