public Set<String> getEntityTypes() {
        return ENTITY_TYPES;
    }
Gets set of entity types recognised by this recogniser

@return set of entity classes/types
tika-parsers/tika-parsers-ml/tika-parser-nlp-module/src/main/java/org/apache/tika/parser/ner/nltk/NLTKNERecogniser.java