The nextfocus and prevfocus attributes contain IDREFs of other elements.
nextfocus和prevfocus属性包含其他元素的IDREF。
They are used about as much as XML's ID and IDREFs, which is to say that some applications will use them a lot, and some never.
其应用情况与XML的ID和IDREF相似，也就是说，有些应用程序会大量使用，而有些应用程序则根本不使用它们。
Using these attributes, an element may refer to one or more other elements (by including the value of those elements' ID fields in the pointing element's own IDREF or IDREFS field).
通过使用这些属性，元素可以引用一个或多个其它元素(通过在指向元素自己的IDREF或idrefs域中包含那些元素的标识字段的值)。
Using these attributes, an element may refer to one or more other elements (by including the value of those elements' ID fields in the pointing element's own IDREF or IDREFS field).
通过使用这些属性，元素可以引用一个或多个其它元素(通过在指向元素自己的IDREF或idrefs域中包含那些元素的标识字段的值)。
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