Processing cost is directly proportional to the size of the message tree.

处理成本与消息树的大小之间存在直接的正比关系。

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XML programming is a chore, among other reasons, because processing must navigate to each element through the tree.

XML编程是一项繁重的工作，因为处理必须通过树导航到各个元素。

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This interpreter USES the decorated style sheet tree to drive processing.

该解释器使用装饰样式表树来驱动处理。

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