function
| Library: Markup utilities (OMMARKUPUTILITIES) Import : ommarkuputilities.xmd | Returns: the alternative URI | 
export string function
   map-uri  via value entity-resolver resolver
           from value string          uri
    
 Function map-uri attempts to map one URI to another, as specified by the resolver. If
        the resolver does not specify a replacement URI, this function will throw resolution-failure.
      
 The function is used by read-entity, which falls back to the original URI if map-uri fails
        with resolution-failure. Through read-entity, map-uri is also indirectly invoked by
        external-entity-resolver, external-entities-resolved, and parse-entity. It thus provides a
        central place to override the entire behaviour of the default entity-resolver.