<xs:simpleType name="proofType">
    <xs:restriction base="xs:string">
        <xs:enumeration value="Blues" />
        <xs:enumeration value="ColorKey" />
        <xs:enumeration value="Cromalin" />
        <xs:enumeration value="CustomCromalin" />
        <xs:enumeration value="DigitalProofs" />
        <xs:enumeration value="Dylux" />
        <xs:enumeration value="FilmProofs" />
        <xs:enumeration value="FoldedGathered" />
        <xs:enumeration value="InkDrawDown" />
        <xs:enumeration value="Iris" />
        <xs:enumeration value="MatchPrint" />
        <xs:enumeration value="PressProofs" />
        <xs:enumeration value="ReferenceCDCassette" />
        <xs:enumeration value="Samples" />
        <xs:enumeration value="T-Print" />
        <xs:enumeration value="Other" />
    </xs:restriction>
</xs:simpleType>

• proofType
• pn:ProofType