You will find that as your SOA systems grow and change, you will need to have versioning polices for all contract artifacts: service interfaces, messages and data schemas, policies, etc.
你会发现，随着你SOA系统的成长和变更，你会需要针对所有契约制品的版本管理策略：服务接口、消息和数据的模式、策略等。
Plus, versioning of services is critical: systems simply cannot be taken down in order to upgrade a service, so this capability needs to be in from the start and managed in a dynamic way.
另外，对服务进行版本管理是重要的，系统在升级一个服务时决定不能被关闭，所以需要从一开始就拥有一个动态管理的能力。
What can be easily downloaded only works with a few Scheme systems, and versioning is unclear.
容易下载的那些只能用于少数scheme系统，而且版本也不清楚。
The biggest difference between versioning and other Undo systems is that the user must explicitly request the version—recording a copy or snapshot of the document.
历史版本和其他撤销系统之间的主要差别在于用户必须显式地调用历史版本，记录一个复制或者文档的快照。
The biggest difference between versioning and other Undo systems is that the user must explicitly request the version—recording a copy or snapshot of the document.
历史版本和其他撤销系统之间的主要差别在于用户必须显式地调用历史版本，记录一个复制或者文档的快照。
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