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.
在向查询使用者提供结果之前，会先将结果累计到输出缓冲区中。
Results will accumulate into an output buffer before they are available to the consumer of the query.
在向查询使用者提供结果之前，会先将结果累计到输出缓冲区中。
Results will accumulate into an output buffer before they are available to the consumer of the query.
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