code: def find_germanet_xml_files(xml_path):
      '''
      Globs the XML files contained in the given directory and sorts
      them into sections for import into the MongoDB database.
      Arguments:
      - `xml_path`: the path to the directory containing the GermaNet
        XML files
      '''
      xml_files = sorted(glob.glob(os.path.join(xml_path, '*.xml')))
      lex_files = [xml_file for xml_file in xml_files if
                   re.match(r'(adj|nomen|verben)\.',
                            os.path.basename(xml_file).lower())]
      xml_files = sorted(set(xml_files) - set(lex_files))
      if not lex_files:
          print('ERROR: cannot find lexical information files')
      gn_rels_file = [xml_file for xml_file in xml_files if
                      os.path.basename(xml_file).lower() == 'gn_relations.xml']
      xml_files = sorted(set(xml_files) - set(gn_rels_file))
      if not gn_rels_file:
          print('ERROR: cannot find relations file gn_relations.xml')
          gn_rels_file = None
      else:
          if 1 < len(gn_rels_file):
              print ('WARNING: more than one relations file gn_relations.xml, '
                     'taking first match')
          gn_rels_file = gn_rels_file[0]
      wiktionary_files = [xml_file for xml_file in xml_files if
                          re.match(r'wiktionaryparaphrases-',
                                   os.path.basename(xml_file).lower())]
      xml_files = sorted(set(xml_files) - set(wiktionary_files))
      if not wiktionary_files:
          print('WARNING: cannot find wiktionary paraphrase files')
      ili_files = [xml_file for xml_file in xml_files if
                  os.path.basename(xml_file).lower().startswith(
              'interlingualindex')]
      xml_files = sorted(set(xml_files) - set(ili_files))
      if not ili_files:
          print('WARNING: cannot find interlingual index file')
      if xml_files:
          print('WARNING: unrecognised xml files:', xml_files)
      return lex_files, gn_rels_file, wiktionary_files, ili_files