https://opennlp.apache.org/docs/3.0.0-M2/apidocs/opennlp-api/opennlp/tools/util/featuregen/package-summary.html
opennlp.tools.util.featuregen (Apache OpenNLP :: API 3.0.0-M2 API)
declaration: package: opennlp.tools.util.featuregen
opennlptoolsutilapacheapi