code: def setup_top_concepts(rdf, mark_top_concepts):
      
  
      for cs in sorted(rdf.subjects(RDF.type, SKOS.ConceptScheme)):
          for conc in sorted(rdf.subjects(SKOS.inScheme, cs)):
              if (conc, RDF.type, SKOS.Concept) not in rdf:
                  continue  # not a Concept, so can't be a top concept
              # check whether it's a top concept
              broader = rdf.value(conc, SKOS.broader, None, any=True)
              if broader is None:  # yes it is a top concept!
                  if (cs, SKOS.hasTopConcept, conc) not in rdf and \
                     (conc, SKOS.topConceptOf, cs) not in rdf:
                      if mark_top_concepts:
                          logging.info(
                              "Marking loose concept %s "
                              "as top concept of scheme %s", conc, cs)
                          rdf.add((cs, SKOS.hasTopConcept, conc))
                          rdf.add((conc, SKOS.topConceptOf, cs))
                      else:
                          logging.debug(
                              "Not marking loose concept %s as top concept "
                              "of scheme %s, as mark_top_concepts is disabled",
                              conc, cs)
docs: Determine the top concepts of each concept scheme and mark them using
      hasTopConcept/topConceptOf.