code: public void setCategories(StringArray v) {
      if (GOMention_Type.featOkTst && ((GOMention_Type)jcasType).casFeat_categories == null)
        jcasType.jcas.throwFeatMissing("categories", "de.julielab.jules.types.GOMention");
      jcasType.ll_cas.ll_setRefValue(addr, ((GOMention_Type)jcasType).casFeatCode_categories, jcasType.ll_cas.ll_getFSRef(v));}
docs: setter for categories - sets created for the shared task, here we add the group
  @generated
  @param v value to set into the feature