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。
In other words, given an IDREF or IDREFS field, it's possible to quickly find the element or elements with the associated ID or IDs, but not the other way around.
换句话说，给定一个IDREF或idrefs域，可能会迅速找到有一个或多个相关标识的一个或多个元素，反之则不行。
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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