This node assigns to each term of a document a part of speech (POS) tag. Therefore the Penn Treebank tag set is used, for details see (http://www.cis.upenn.edu/~treebank). The underlying tagger model deciding what tag to assign to which term is a model of the opennlp framework version 1.5.2 (see for http://opennlp.apache.org/documentation.html details).