<xs:simpleType name="trayType"> <xs:restriction base="xs:string"> <xs:enumeration value="MixedLengthTrays" /> <xs:enumeration value="1ft Tray" /> <xs:enumeration value="2ft Tray" /> <xs:enumeration value="EMM Tray" /> <xs:enumeration value="Flat Tub" /> </xs:restriction> </xs:simpleType>