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   URI-references and resources correspond on a many-to-one basis.  A URI-reference designates a single distinct resource, but
            a given resource may have more than one URI-reference.  
   In a DAF implementation one URI-reference for each resource is distinguished. This is the URI returned by ResourceIDService
            when the ResourceID is translated. 
   Conversely, the ResourceIDService must be able to translate the distinguished URI-reference of a resource to its ResourceID.
            It is implementation dependent whether the ResourceIDService can translate any other URIs for the same resource to its ResourceID.