两个 behaviors 之间可以有关系么？

e.g.ancestorBehavior.js:

---

export default Behavior({    relations: {

        descendant: {

            type: “descendant”,

            target: descendantBehavior,

            linked() { },

            linkChanged() { },

            unlinked() { }

        }

    }

});

descendantBehavior.js:

export default Behavior({
    relations: {

        ancestor: {

            type: "ancestor",

            target: ancestorBehavior,

            linked() { },

            linkChanged() { },

            unlinked() { }

        }

    }

});

我还需要做什么吗?