code: private void loadTokevalParameters() {
      this.tokevalParser.addArgument("-l", "--language").required(true)
          .choices("ca", "de", "en", "es", "eu", "fr", "it")
          .help("Choose language.\n");
      this.tokevalParser.addArgument("-t", "--testset").required(true)
          .help("The test or reference corpus.\n");
    }
docs: Create the parameters available for evaluation.