function
| Library: Markup utilities (OMMARKUPUTILITIES) Import : ommarkuputilities.xmd | Returns: the URI of the entity | 
export dynamic string function
   map-external-identifier               via value entity-resolver resolver
                           public-identifier value string          public-id  optional
                           system-identifier value string          system-id  optional
    
 Function map-external-identifier attempts to map an external entity identified by its public and
        system identifier to its file path or a different kind of URI that refers to the entity. If the entity cannot be
        resolved into a URI, resolution-failure will be thrown.