如果需要管理和操纵XML数据，XQuery就是程序库、应用程序编程或者服务栈所提供的功能规范。
Whenever XML data needs to be managed and manipulated, XQuery is a specification for functions that a library or an application programming or service stack can provide.
它们必须向其他程序库和程序(比如命令解释程序和SQL服务器)发出请求。
They must make requests to other libraries and programs, such as command interpreters and SQL servers.
为这些卡片给出合适的估算大小也很困难：例如更新一台服务器上的应用程序库时会不会影响到看似不相干的领域？
And giving these stories sizes was difficult to say the least, since estimation is often difficult - will updating a lib on a server affect other seemingly unrelated areas?
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