这些数据可以是之前缓存好的内容，也可以是以XML或其他文件格式存储的数据。
That data might be previously cached content, or locally stored data in the form of XML or other file formats.
聚合、组合之类操作的操作符可以是以成员、属性或常量作为输入的操作符。
Operators for aggregation, combination, and such manipulation are provided by means of operators that could take members, attributes, or constants as inputs.
URL查询字符串可以是以“ ？ ”开头的任何内容，通常在URL的路径部分可以看到。
The query string of a URL is everything that follows the "? "that is often seen after the URL's path component.
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