每种服务都有自己的访问URL以及描述如何查询和理解结果的文档。
Each one of them has its own URL for access as well as documents describing how to query and understand the results.
该文档还紧跟了一组使用案例，其中描述了使用新语言的不同场景，包括了特定查询和预期结果。
This document was quickly followed by a set of use cases that described diverse usage scenarios for the new language, including specific queries and expected results.
服务使用XQuery根据对服务请求元数据查询的结果描述判定缓冲是否有效。
The service USES XQuery to determine if the cache is valid based on a query to the metadata description of the service request.
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