code: public void setRef(Constituent v) {
      if (PTBConstituent_Type.featOkTst && ((PTBConstituent_Type)jcasType).casFeat_ref == null)
        jcasType.jcas.throwFeatMissing("ref", "de.julielab.jules.types.PTBConstituent");
      jcasType.ll_cas.ll_setRefValue(addr, ((PTBConstituent_Type)jcasType).casFeatCode_ref, jcasType.ll_cas.ll_getFSRef(v));}
docs: setter for ref - sets Th reference from the null constituent to the corresponding lexicalized constituent, O
  @generated
  @param v value to set into the feature