熟悉文档对象模型(DOM)可以帮助理解节点的概念，但不是必需的。
Familiarity with the Document Object Model (DOM) is helpful for an understanding of nodes, but is not required.
理论上说，最坏情况下概念的节点个数会以形式背景对象个数和属性个数的指数倍增长。
Theoretically speaking, the nodes number of the lattice will make an exponential increase for the growth of objects and attributes in the worst condition.
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