出现了几种新的 XML 模式语言以替代或增强 DTD，其中包括 RELAX NG，它以简洁性和表达能力著称。

Several new XML schema languages have emerged to supplant or augment DTDs, including RELAX NG, which is renowned for its simplicity and expressiveness.

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XQuery的表达能力可以与为数据库查询语言定义的“关系完整性”标准相比，虽然还没有为XML数据模型定义这样的正式标准。

The expressive power of XQuery is comparable to the criterion of "relational completeness" defined for database query languages, though no such formal standard has been defined for an XML data model.

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在各种语言中，表达性就相当于其能力。

In languages, expressiveness equals power.

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