Document type definitions (DTDs) registered and stored in internal tables.

文档类型定义(DTD)注册并存储在内部表中。

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Validate XML documents against document Type Definitions (DTDs) and XML schemas.

用文档类型定义(DTD)和XML Schemas验证XML文档。

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XML is also rich with embedded meta data and other descriptive entities such as schemas and Document Type Definitions (DTDs).

XML也富含嵌入式元数据和其他描述性实体，比如模式和Document Type Definition (DTD)。

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