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As with the namespaces for user-defined values, the Namespace attribute for a proprietary identifier should contain the DPID (without a namespace prefix) of the organisation controlling the identifier system used. Typically, this will be the organisation that sends the DDEX message or a company that has forwarded the identifier to the message sender.


As a consequence of the above, it is possible to find the namespace value for such identification systems in the DDEX Party Identifier Repository which all users of the DDEX standard have access to.