Learn to use the document Object Model (DOM), a tree API that provides direct access to parts of an XML document.

学习使用文档对象模型(Document Object Model, DOM)，使用这种树api可以直接访问XML文档的各个部分。

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Since the user is not using a tree-based object model to access this part of the document, constructing the entire tree would lead to a waste of memory due to replication of data.

因为用户不使用基于树的对象模型来访问这部分文档，所以构造完整的树会因为数据重复而浪费内存。

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The document Object Model specifies a tree-based representation for an XML document.

文档对象模型为XML文档指定了树型表示。

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