在RSS 0.91中，每个频道只能包含15个项，而且元素的长度也有限制，现在这些限制都取消了。
In RSS 0.91, each channel could only contain 15 items, and elements were limited in length; these limits have been removed.
不过这个例子没有限制XML内容的大小，而是通过计算节点数把XML元素限制为100个book项。
Rather than limit the XML content size, the sample application limits the size of the XML elements to 100 book items by counting the nodes.
产量限制协定。一项关于限制产量的协定是非法的。因为它削减了产品和服务的供应量，这就不可避免地引发了价格上涨。
Agreements to restrict output. An agreement to restrict production or output is illegal because reducing the supply of a product or service inevitably drives up its price.
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