On the other hand, decomposition of XML data into relational columns is a complex and costly process, and it removes the self-descriptive semantic information within the XML.
另一方面，将XML数据分解为关系列是一个复杂的流程，成本太高，而且它移除了XML中的自我描述语义信息。
The first six types are largely self-descriptive (see the Lua novelties section above for the exceptions); the last two need some explanation.
前6种类型基本上是自描述的（例外情况请参见上面的Lua 特性一节）；最后两个需要一点解释。
But, as a self-descriptive markup language, XML has solved the problem to a great extent.
而XML作为一种自描述性的标记语言在很大程度上解决了这个问题。
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.
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.
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。
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