例如，如果一个服务调用某个特定的数据源或数据库，那么应将此数据源添加到部署拓扑中，如图2所示。
For instance, if a service calls to a specific data source or database, add that source to the deployment topology as shown in Figure 2.
正如名字所暗含的那样，数据源就是对获取数据源头的链接，例如一个服务器、数据库或者文件。
As the name suggests, the data source is a connection to the source from which the report retrieves data, such as a server, database, or file.
得益于调用透明性，它也不需要知道源数据库所支持的语言或编程接口。
Nor does it need to know what language or programming interface is supported by the source database, thanks to invocation transparency.
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