These two components could communicate with each other, across this type-compatible service/referencepair.
这两个组件可以凭借这种类型兼容的服务/引用来实现相互通信。
2
Also, having a fresh pair ofshoes as a reference will help you notice when your old ones are readyto be replaced.
还有，把一双新鞋作为参考会帮助你注意到什么时候你的旧鞋可以被换掉了。
3
If the Address type did not have a phone element and, therefore, did not reference the urn: listing5 namespace, then this pair, Listings 4 and 5, would be legal.