code: public String getCategories(int i) {
      if (GOMention_Type.featOkTst && ((GOMention_Type)jcasType).casFeat_categories == null)
        jcasType.jcas.throwFeatMissing("categories", "de.julielab.jules.types.GOMention");
      jcasType.jcas.checkArrayBounds(jcasType.ll_cas.ll_getRefValue(addr, ((GOMention_Type)jcasType).casFeatCode_categories), i);
      return jcasType.ll_cas.ll_getStringArrayValue(jcasType.ll_cas.ll_getRefValue(addr, ((GOMention_Type)jcasType).casFeatCode_categories), i);}
docs: indexed getter for categories - gets an indexed value - created for the shared task, here we add the group
  @generated
  @param i index in the array to get
  @return value of the element at index i