code: def initialize_concept_scheme(rdf, cs, label, language, set_modified):
      
  
      # check whether the concept scheme is unlabeled, and label it if possible
      labels = list(rdf.objects(cs, RDFS.label)) + \
          list(rdf.objects(cs, SKOS.prefLabel))
      if len(labels) == 0:
          if not label:
              logging.warning(
                  "Concept scheme has no label(s). "
                  "Use --label option to set the concept scheme label.")
          else:
              logging.info(
                  "Unlabeled concept scheme detected. Setting label to '%s'" %
                  label)
              rdf.add((cs, RDFS.label, Literal(label, language)))
  
      if set_modified:
          curdate = datetime.datetime.utcnow().replace(microsecond=0).isoformat() + 'Z'
          rdf.remove((cs, DCTERMS.modified, None))
          rdf.add((cs, DCTERMS.modified, Literal(curdate, datatype=XSD.dateTime)))
docs: Initialize a concept scheme: Optionally add a label if the concept
      scheme doesn't have a label, and optionally add a dct:modified
      timestamp.