<xs:attribute name="productID" type="xs:string" use="required">
<xs:annotation>
<xs:documentation>This is to facilitate the unique identification of a particular product. To ensure uniqueness it is recommended that a Universal Unique IDentifier (UUID) be used as the productID. UUIDs can be generated on any computer, regardless of platform or operating system. A UUID is a 128-bit (16-byte) integer that is virtually guaranteed to be unique in the world across space and time. The Open Software Foundation (OSF) created UUIDs, as part of their Distributed Computing Environment (DCE).</xs:documentation>
</xs:annotation>
</xs:attribute>
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