code: def get_uri_schemaloc_map(self):
          
          mapping = {}
  
          for ni in six.itervalues(self.__ns_uri_map):
              if ni.schema_location:
                  mapping[ni.uri] = ni.schema_location
  
          return mapping
docs: Constructs and returns a map from namespace URI to schema location
          URI.  Namespaces without schema locations are excluded.