规则编辑器提供了基本编辑特性（比如语法检查）。

The rule editor provides basic editing features (such as syntax checking and highlighting).

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为了避免为一个类型创建多个断言，每个断言规则都要检查是否在工作存储器中存在一个评估事实(图18)。

To avoid multiple assessments of the same type being created, each of these assessment rules checks the working memory for the existence of an assessment fact (Figure 18).

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退回方案允许单个检查器，去处理所有呈递的规则结果，并允许不同的检查器联系树状图的任何地方，以替换默认的行为。

The fallback scheme permits a single viewer to handle all rule result rendering, yet allows alternate viewers to be attached anywhere in the tree to override the default behavior.

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