It specifies the uniform resource indicator (URI) referenced by XML instance documents.

它指定由XML实例文档引用的统一资源指示符(uri)。

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Subsequent executions, of course, will benefit from the result of patching the code so that the instance or static field, or method target, is more directly referenced.

当然，后续执行将从修补代码中获益，从而可以更直接地引用实例、静态字段或方法目标。

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This means that whenever the element BookSales is referenced, the XML instance document will include number and price information with the title, the author, and the ISBN (see Listing 7).

这意味着无论何时引用元素 BookSales ，XML 实例文档都将在包含书名、作者和 ISBN 的同时包含销量和售价信息（请参阅清单 7）。

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For instance, the media has referenced the iPhone more frequently than the iPod since about June.

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