通过声明抽象的元素或者类型，XML Schema提供了一种强制替换机制。
By declaring an element or type to be abstract, XML Schema provides a mechanism to force substitution for it.
通过部首或语义元素的组合，单个复合词可以表达复杂的概念关系，通常具有抽象的普遍性。
By the combination of radicals or semantic elements, single compound words can express complex conceptual relations, often of an abstract universal character.
您也可以对引用一个抽象元素的替换使用这种技巧。
You can also use this technique with substitutions that reference an abstract element.
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