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。

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.

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在 DOM 中，文档被模型化为一棵树，其中每个 XML 语法成分（如元素和文本内容）都用一个节点表示。

In DOM, the document is modeled as a tree, where each component of the XML syntax (such as an element or text content) is represented by a node.

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文档对象模型为XML文档指定了树型表示。

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

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