code: private static String mapFrenchCCTagSetToNAF(final String postag) {
      if (postag.startsWith("ADV")) {
        return "A"; // adverb
      } else if (postag.equalsIgnoreCase("CC") || postag.equalsIgnoreCase("CS")) {
        return "C"; // conjunction
      } else if (postag.startsWith("D") || postag.startsWith("I")) {
        return "D"; // det predeterminer
      } else if (postag.startsWith("ADJ")) {
        return "G"; // adjective
      } else if (postag.startsWith("NC")) {
        return "N"; // common noun
      } else if (postag.startsWith("NPP")) {
        return "R"; // proper noun
      } else if (postag.startsWith("PRO") || postag.startsWith("CL")) {
        return "Q"; // pronoun
      } else if (postag.equalsIgnoreCase("P") || postag.equalsIgnoreCase("P+D")
          || postag.equalsIgnoreCase("P+PRO")) {
        return "P"; // preposition
      } else if (postag.startsWith("V")) {
        return "V"; // verb
      } else {
        return "O"; // other
      }
    }
docs: Mapping between CC tagset and NAF.
  
  @param postag
  the postag
  @return the mapping to NAF pos tagset