code: public Relation getRelation_ref() {
      if (RelationMention_Type.featOkTst && ((RelationMention_Type)jcasType).casFeat_relation_ref == null)
        jcasType.jcas.throwFeatMissing("relation_ref", "de.julielab.jules.types.ace.RelationMention");
      return (Relation)(jcasType.ll_cas.ll_getFSForRef(jcasType.ll_cas.ll_getRefValue(addr, ((RelationMention_Type)jcasType).casFeatCode_relation_ref)));}
docs: getter for relation_ref - gets
  @generated
  @return value of the feature