名称空间是元素或属性的标识符的一部分。

A namespace is a part of the identifier for an element or attribute.

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API没有提供查询模式结构或属性的方法。

The API provides no means to permit querying of the schema's structure or properties.

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模式创作者经常希望实施涉及到多个元素或属性的规则。

Schema authors often want to enforce rules that involve more than one element or attribute.

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