This type of network restriction works without additional configuration.

即使不进行额外的配置，这类网络限制也会起作用。

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The ability to validate XML, or ensure that it satisfies some restriction based on type, is inherent in the language itself; Document Type Definitions are part of the XML specification.

验证 XML 或确保满足基于类型的某些限制是语言自身所固有的能力；Document Type Definitions 是 XML 规范的一部分。

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Derivation by restriction is useful in cases where you want to create a subset of the base type.

通过限制实现的派生在希望创建基类型的子集的情况下有用。

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