一个源可能是一个主引用，而其他源利用它的数据。
One source may be a primary reference while the other source utilizes the data.
一个Atom订阅源由一个主元素feed组成，其中包括一些初始的元数据(例如，订阅源标题、作者、URL、它引用的全部内容的URL)。
An Atom feed consists of a single main feed element, which includes some initial metadata (for example, the title of the feed, any authors, its URL, and the URL of the overall content it refers to).
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