Union type allowing either standard ReferentTypeEnum values or user-defined values via OtherNameType pattern.This provides extensibility while maintaining a core controlled vocabulary of standard referent types.
<simpleType name="ReferentTypeEnumType"><annotation><documentation>Union type allowing either standard ReferentTypeEnum values or user-defined values via OtherNameType pattern. This provides extensibility while maintaining a core controlled vocabulary of standard referent types.</documentation></annotation><union memberTypes="diggs:OtherNameType diggs:ReferentTypeEnum"/></simpleType>