<xs:simpleType name="processingStatus" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:restriction base="xs:string"> <xs:enumeration value="NOT_ACKNOWLEDGED" /> <xs:enumeration value="PENDING" /> <xs:enumeration value="COMPLETED" /> <xs:enumeration value="PROCESSED" /> </xs:restriction> </xs:simpleType>