<xs:simpleType name="productIdentifierType">
    <xs:restriction base="xs:string">
        <xs:enumeration value="BrandName" />
        <xs:enumeration value="CatalogueNumber" />
        <xs:enumeration value="CustomsTariffNumber" />
        <xs:enumeration value="EAN8" />
        <xs:enumeration value="EAN13" />
        <xs:enumeration value="ExportHarmonisedSystemCode" />
        <xs:enumeration value="FinishedGoodIdentifier" />
        <xs:enumeration value="GradeCode" />
        <xs:enumeration value="GradeName" />
        <xs:enumeration value="ImportHarmonisedSystemCode" />
        <xs:enumeration value="ManufacturingGradeCode" />
        <xs:enumeration value="ManufacturingGradeName" />
        <xs:enumeration value="Ondule" />
        <xs:enumeration value="PartNumber" />
        <xs:enumeration value="RFQPartNumber" />
        <xs:enumeration value="SKU" />
        <xs:enumeration value="UPC" />
        <xs:enumeration value="Other" />
    </xs:restriction>
</xs:simpleType>

• productIdentifierType
• pn:ProductIdentifierType