code: def load_uri(self, uri):
          
  
          # if self.verbose: printDebug("----------")
          if self.verbose: printDebug("Reading: <%s>" % uri, fg="green")
          success = False
  
          sorted_fmt_opts = try_sort_fmt_opts(self.rdf_format_opts, uri)
  
          for f in sorted_fmt_opts:
              if self.verbose:
                  printDebug(".. trying rdf serialization: <%s>" % f)
              try:
                  if f == 'json-ld':
                      if self.verbose:
                          printDebug(
                              "Detected JSONLD - loading data into rdflib.ConjunctiveGraph()",
                              fg='green')
                      temp_graph = rdflib.ConjunctiveGraph()
                  else:
                      temp_graph = rdflib.Graph()
                  temp_graph.parse(uri, format=f)
                  if self.verbose: printDebug("..... success!", bold=True)
                  success = True
                  self.sources_valid += [uri]
                  # ok, so merge
                  self.rdflib_graph = self.rdflib_graph + temp_graph
                  break
              except:
                  temp = None
                  if self.verbose: printDebug("..... failed")
                  # self._debugGraph()
  
          if not success == True:
              self.loading_failed(sorted_fmt_opts, uri=uri)
              self.sources_invalid += [uri]
docs: Load a single resource into the graph for this object. 
  
          Approach: try loading into a temporary graph first, if that succeeds merge it into the main graph. This allows to deal with the JSONLD loading issues which can solved only by using a  ConjunctiveGraph (https://github.com/RDFLib/rdflib/issues/436). Also it deals with the RDFA error message which seems to stick into a graph even if the parse operation fails. 
          
          NOTE the final merge operation can be improved as graph-set operations involving blank nodes could case collisions (https://rdflib.readthedocs.io/en/stable/merging.html)  
  
          :param uri: single RDF source location
          :return: None (sets self.rdflib_graph and self.sources_valid)