code: def src_to_dst(self, src_uri):
          
          for map in self.mappings:
              dst_path = map.src_to_dst(src_uri)
              if (dst_path is not None):
                  return(dst_path)
          # Must have failed if loop exited
          raise MapperError(
              "Unable to translate source URI (%s) into "
              "a destination path." % (src_uri))
docs: Map source URI to destination path.