/**
  * prune existing 'constit' annotations on 'span' of 'doc' using information from a part-of-speech
  * tagger. Words are assumed, on entry, to have multiple 'constit' annotations from dictionary
  * look-up, reflecting the POS ambiguity of the words; this ambiguity will be reduced using a
  * tagger. Words are first assigned 'tagger' annotations with feature cat = a Penn tag. This
  * information is then used to remove 'constit' annotations not consistent with the Penn tag.
  */
 public void prune(Document doc, Span span) {
   annotate(doc, span, "tagger");
   Retagger.pruneConstit(doc, span);
 }
 /**
  * tag 'span' of 'doc' according to the Jet part of speech set. Words are first assigned 'tagger'
  * annotations with feature cat = a Penn tag. Then these are mapped to Jet tags, and 'constit'
  * annotations are added with cat = a Jet part-of-speech tag.
  */
 public void tagJet(Document doc, Span span) {
   annotate(doc, span, "tagger");
   Retagger.mapConstit(doc, span);
 }