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DDEX makes heavy use of allowed-value sets (aka code lists). This is essential for automated processing of DDEX messages.

There are, however, circumstances where the DDEX-defined list of allowed values does not meet a particular business need. For such cases, DDEX allows to communicate user-defined values:

<tag Namespace="..." UserDefinedValue="MyValue">UserDefined</tag>

The Namespace attribute needs to carry the DPID of the party controlling MyValue.

Augmenting an allowed value

Sometimes a user wants to augment a DDEX-defined value with more specific information. The recommended approach is to include two tags with the appropriate values as follows;

<ResourceContributorRole>Artist</ResourceContributorRole>
<ResourceContributorRole Namespace="..." UserDefinedValue="Vocals">UserDefined</ResourceContributorRole>

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