根据W3C所提供的RDF资源元数据规范，采用XML的形式给出了三类资源的元数据描述文件及其自动生成方法。

And then present the XML documents of the three types of resource's metadata based on the RDF metadata standard that has supplied by W3C, and introduced its auto-generating method.

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为了获得最大的可移植性，我们建议将DXL文档转换为可以更有效地描述数据的XML文件。

For maximum portability, we recommend transforming the DXL document to an XML file that can describe your data more effectively.

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普通的元数据集包括文件名、作者、创建时间和更新时间；不过，对于某些情况，普通的元数据集不足以描述文件的属性。

The common set of metadata includes file name, author, created time, and updated time; however, in some cases, the common metadata is not sufficient to describe the file properties.

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