事实上，这些代码都极具自我描述性。

Actually the code is quite self explanatory.

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XML具有清晰的结构及自我描述性，适合用来进行数据交换。

XML has clear framework and self-description, which makes it suitable for data exchange.

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而且由于PDPEL基于XML格式，具有XML的优点，如：开放性、简单性、自我描述性、结构与内容分离和良好的可扩展性等。

The PDPEL is based on XML, so it includes the advantages of XML, such as: Openness, simplicity, self-descriptive, Separation of structure and content, and good scalability, and so on.

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