There is often a third category of service, the information service, which provides direct access to data contained within a (typically federated) data source.
经常还有第三类服务，信息服务，用于提供对数据源(通常为联合数据源)中包含的数据的直接访问。
Clicking the hyperlink opens the source document and gives you direct access to the targeted data.
单击超链接打开源文档，直接访问目标数据。
Clicking the hyperlink opens the source document and gives you direct access to the targeted data.
单击超链接打开源文档，直接访问目标数据。
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