code: def ck2respth(argv=None):
      
      parser = ArgumentParser(
          description='Convert a ChemKED YAML file to a ReSpecTh XML file.'
          )
      parser.add_argument('-i', '--input',
                          type=str,
                          required=True,
                          help='Input filename (e.g., "file1.xml")'
                          )
      parser.add_argument('-o', '--output',
                          type=str,
                          required=False,
                          default='',
                          help='Output filename (e.g., "file1.yaml")'
                          )
  
      args = parser.parse_args(argv)
  
      c = chemked.ChemKED(yaml_file=args.input)
      c.convert_to_ReSpecTh(args.output)
docs: Command-line entry point for converting a ChemKED YAML file to a ReSpecTh XML file.