习惯且公开的服务破坏 customary-public service sabotage
holder类的内容是通过远程方法调用修改的，且服务客户机在方法调用后可以使用这些修改过的内容。
The contents of the Holder class are modified by the remote method calls and the service client can use this changed content after the method invocation.
松散——所有不兼容的更改导致服务契约的新版本，且服务契约的设计既支持向后兼容，也支持向前兼容。
Loose - Any incompatible change results in a new version of the service contract and the contract is designed to support backwards compatibility and forwards compatibility.
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