<xs:simpleType name="category" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:restriction base="xs:string"> <xs:enumeration value="TRAVEL_AND_SUBSISTENCE" /> <xs:enumeration value="REMOTE_WORKING_DAILY_ALLOWANCE" /> <xs:enumeration value="SMALL_BENEFITS_EXEMPTION" /> </xs:restriction> </xs:simpleType>