docs: def load_uri(self, uri, verbose):
          """
          
          :param uri:
          :param rdf_format_opts:
          :param verbose:
          :return:
          """
  
          if verbose: printDebug("----------")
          if verbose: printDebug("Reading: <%s>" % uri)
          success = False
          for f in self.rdf_format_opts:
              if verbose: printDebug(".. trying rdf serialization: <%s>" % f)
              try:
                  self.rdfgraph.parse(uri, format=f)
                  if verbose: printDebug("..... success!", bold=True)
                  success = True
                  self.sources_valid += [uri]
                  break
              except:
                  if verbose: printDebug("..... failed")
  
          if not success == True:
              self.loading_failed(self.rdf_format_opts)
              self.sources_invalid += [uri]