Using samples makes it clear which element is the root element in any given document type and provides examples of typical data for each element.

使用样例就能清楚地看出任何给定文档类型中哪个元素是根元素，并为每个元素提供典型数据的例子。

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Validation is a process of checking whether the instance document satisfies structural, data type, and content constraints specified in the XML schema.

验证就是检查实例文档是否满足在XML模式中指定的结构、数据类型和内容限制的过程。

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Data of different types is indicated by namespaces for each type, allowing multiple data formats to be embedded in the same document.

不同类型的数据用每种类型的名称空间指定，允许同一文档中嵌入多种数据格式。

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