CLIPS-规则优先级

原创于 2009-12-26 13:38:00 发布 · 528 阅读

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本文介绍了CLIPS规则引擎中规则优先级的设置方法及其实现效果。通过使用(declare(salience))来指定不同规则的优先级，优先级高的规则会优先执行。当规则优先级相同时，则遵循后进先出的原则。

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一、

１、 (declare (salience20))声明了规则的优先级，数字越大优先级越高

２、　在规则同等优先级的情况下，事实按照堆栈的要求处理，后进先出。所以有：

CLIPS> (run)
third
second

二、

CLIPS> (clear)
CLIPS> (defrule first
(first first)
=>
(printout t "second" crlf))
CLIPS> (defrule second
(second second)
=>
(printout t "third" crlf))
CLIPS> (assert (firstfirst)(second second))
<Fact-2>
CLIPS> (run)
third
second
CLIPS> (clear)
CLIPS> (defrule first
   (declare (salience 20))
   (first first)
   =>
   (printout t "second"crlf))
CLIPS> (defrule second
   (declare (salience 10))
   (second second)
   =>
   (printout t "third"crlf))
CLIPS> (run)
CLIPS> (assert (first first)(second second))
<Fact-2>
CLIPS> (run)
second