code: def verify_processing_options(opt, parser):
      
      scheme_types = scheme_prefix.values()
      if opt.processing_scheme.split(':')[0] not in scheme_types:
          parser.error("(%s) is not a valid scheme type.")
docs: Parses the  processing scheme options and verifies that they are
         reasonable.
  
  
      Parameters
      ----------
      opt : object
          Result of parsing the CLI with OptionParser, or any object with the
          required attributes.
      parser : object
          OptionParser instance.