code: public String getVolume() {
      if (Journal_Type.featOkTst && ((Journal_Type)jcasType).casFeat_volume == null)
        jcasType.jcas.throwFeatMissing("volume", "de.julielab.jules.types.Journal");
      return jcasType.ll_cas.ll_getStringValue(addr, ((Journal_Type)jcasType).casFeatCode_volume);}
docs: getter for volume - gets The volume number of the journal in which the article was published, O
  @generated
  @return value of the feature