They tend to provide useful ancillary functions as well, such as document validation.

它们还希望提供有用的辅助功能，例如文档验证。

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Document Manager (MBean) : Provides document management functions, such as state management, validation, transformation, document-level security services, and so forth.

Document Manager (MBean)：提供文档管理功能，例如，状态管理、验证、转换、文档层安全性服务等等。

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The parser might also provide additional services such as validation (making sure the document conforms to an XML Schema or a DTD) or namespace resolution.

解析器可能还提供其他服务，比如验证(保证文档符合XML Sche ma或dtd)或者名称空间解析。

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