中文XML论坛--jess in Action 中的第一个例子，运行不出结果，懂的帮忙看看，谢谢！

贴子主题： jess in Action 中的第一个例子，运行不出结果，懂的帮忙看看，谢谢！

本主题类别:

这是我的代码，主要抄书上的
(deftemplate pants-color (slot of) (slot is))
(deftemplate position (slot of) (slot is))

;;(pants-color (of Bob) (is red))

(defrule generate-possibilities
   => (foreach ?name (create$ Fred Joe Bob Tom)
        (foreach ?color (create$ red blue plaid orange)
            (assert (pants-color (of ?name)
                (is ?color))))
    (foreach ?positon (create$ 1 2 3 4)
        (assert (position (of ?name)
                (is ?position))))
    ))

(defrule find-solution
;; There is a golfer named Fred, whose position is ?p1
;; and pants color is ?c1
(position (of Fred) (is ?p1))
(pants-color (of Fred) (is ?c1))
;; The golfer to Fred's immediate right
;; is wearing blue pants.
(position (of ?n&~Fred)
(is ?p&:(eq ?p (+ ?p1 1))))
(pants-color (of ?n&~Fred)
(is blue&~?c1))

;; Joe is in position #2
;;(position (of Joe) (is ?p2&2&~?p1))
;;(pants-color (of Joe) (is ?c2&~?c1))

;; We don't know anything about Joe, really
(position (of Joe) (is ?p2&~?p1))
(pants-color (of Joe) (is ?c2&~?c1))

;; Bob is wearing the plaid pants
(position (of Bob)
(is ?p3&~?p1&~?p&~?p2))
(pants-color (of Bob&~?n)
(is plaid&?c3&~?c1&~?c2))

;; Tom isn't in position 1 or 4
;; and isn't wearing orange
(position (of Tom&~?n)
(is ?p4&~1&~4&~?p1&~?p2&~?p3))
(pants-color (of Tom)
(is ?c4&~orange&~blue&~?c1&~?c2&~?c3))


=>
(printout t Fred " " ?p1 " " ?c1 crlf)
(printout t Joe " " ?p2 " " ?c2 crlf)
(printout t Bob " " ?p3 " " ?c3 crlf)
(printout t Tom " " ?p4 " " ?c4 crlf crlf))

用Eclipse运行结果，居然没有结果

Jess, the Rule Engine for the Java Platform
Copyright (C) 2008 Sandia Corporation
Jess Version 7.1p2 11/5/2008
然后就完了.......

使用jess直接运行是这样的
Jess> (batch "examples/reason.clp")
TRUE
结果只有个TRUE，到底是怎么回事啊
书上说应该显示为
Fred 1 orange
Joe 2 blue
Bob 4 plaid
Tom 3 red
请各位指教！！！


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