一些已经被识别的服务提供者将通过网关公开，他们被逻辑地分成代理组，该代理组是一个服务集合。
A number of service providers have been identified that will be exposed through a Gateway, and they are logically grouped into a Proxy group, which is a collection of services.
别名用于识别每台服务器上所涉及的数据集合(如表、视图、文件)。
Nicknames to identify collections of data (such as tables, views, files) of interest at each server.
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