在模式文档中定位类型定义或元素声明。
Locate type definitions or element declarations in schema documents.
然而，SimpleXML不能针对文档类型定义(DTD)或模式进行验证。
However SimpleXML cannot validate against a Document Type Definition (DTD) or schema.
还可以定义其他技术作为约束机制，如模式或类型系统，甚至可以定义自己的自定义约束解决方案。
You can also define other technologies as constraint mechanisms, such as schemas or type systems -- you can even define your own custom constraint solution.
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