// or other languages as specified in your "skos" vocabulary
ke.setDocumentLanguage("en"); // es for Spanish, fr for French
// Stemmer -- adjust if you use a different language than English or want to alterate results
// (We have obtained better results for Spanish and French with NoStemmer)
ke.setStemmer(new PorterStemmer());
// Stopwords
ke.setStopwords(new StopwordsEnglish());
// Number of Keyphrases to extract