code: public StringArray getFirstIds() {
      if (Cooccurrence_Type.featOkTst && ((Cooccurrence_Type)jcasType).casFeat_firstIds == null)
        jcasType.jcas.throwFeatMissing("firstIds", "ch.epfl.bbp.uima.types.Cooccurrence");
      return (StringArray)(jcasType.ll_cas.ll_getFSForRef(jcasType.ll_cas.ll_getRefValue(addr, ((Cooccurrence_Type)jcasType).casFeatCode_firstIds)));}
docs: getter for firstIds - gets A list of string ids to identify the first occurrence
  @generated
  @return value of the feature