code: def transform_concepts(rdf, typemap):
      
  
      # find out all the types used in the model
      types = set()
      for s, o in rdf.subject_objects(RDF.type):
          if o not in typemap and in_general_ns(o):
              continue
          types.add(o)
  
      for t in types:
          if mapping_match(t, typemap):
              newval = mapping_get(t, typemap)
              newuris = [v[0] for v in newval]
              logging.debug("transform class %s -> %s", t, str(newuris))
              if newuris[0] is None:  # delete all instances
                  for inst in rdf.subjects(RDF.type, t):
                      delete_uri(rdf, inst)
                  delete_uri(rdf, t)
              else:
                  replace_object(rdf, t, newuris, predicate=RDF.type)
          else:
              logging.info("Don't know what to do with type %s", t)
docs: Transform Concepts into new types, as defined by the config file.