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。
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