Application and service level security can range from multi-tenant, with process, file system, and user level isolation, to full hypervisor level isolation.
对应用和服务级安全的支持很广阔，涵盖了从多租户的流程、文件系统和用户级隔离到整个hypervisor一级的隔离。
Multiply that by dozens of applications using a typical service and a typical application using dozens of services, and you can see how simply negotiating message formats can become a full-time task.
再加上数十个使用典型服务的应用程序和使用数十个服务的典型应用程序，您就不难理解直接协商消息格式如何会变成需要全力投入来完成的任务。
Doing so, however, makes the Web service brittle and does not allow an application to take full advantage of the philosophy of loose coupling that has driven the success of the Web services concept.
然而，这样做使得Web服务很不稳定，而且使得应用程序不能充分利用实现Web服务理念的松散连接的基本原理。
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