提出了一种树形知识表示方法，使递归查询可参考事实库状态，从而获得更高效的算法。
A new method of tree scheme knowledge representation is proposed. It enables the recursive query process to consult the states of the extensional database, making the algorithm more efficient.
DKAS系统采用示例式学习方法，从大量经验数据归纳获取知识，知识表示为决策树形式。
By the method of learning from examples, DKAS inductively acquires knowledge, in representation of decision trees, from large amount of experience data.
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