public String getKey() {
    if (DocumentKey_Type.featOkTst && ((DocumentKey_Type)jcasType).casFeat_key == null)
      jcasType.jcas.throwFeatMissing("key", "services.types.DocumentKey");
    return jcasType.ll_cas.ll_getStringValue(addr, ((DocumentKey_Type)jcasType).casFeatCode_key);}