CLIPS DISCREPANCY REPORT

DR #                : 0828
DATE                : 8/8/98
STATUS              : OPEN

REPORTED BY         : Tom Kinlaw
ORGANIZATION        : Compaq
PHONE #             :
ADDRESS             :

CLIPS VERSION       : CLIPS 6.1
HOST                : All
OS                  : All

********************
PROBLEM DESCRIPTION:
********************

Inner member variables in nested instance set queries
could be confused with member variables from an outer
query. This would happen if the inner member variable
name shared all of its characters with the first N
characters of the outer variable name.

*****************
COMMAND SEQUENCE:
*****************
CLIPS> (clear)
CLIPS> (unwatch all)
CLIPS> (defclass cl1
   (is-a USER)
   (role concrete)
   (slot slt
      (create-accessor read-write)))
CLIPS> (deffunction fn1
   ()
   (make-instance in1 of cl1 (slt in1))
   (make-instance in2 of cl1 (slt in2))
   (do-for-instance ((?i cl1)) TRUE
      (do-for-all-instances ((?ii cl1)) TRUE
         (progn
            (printout t "=============" crlf)
            (send ?i print)
            (printout t "?i:gen  " ?i crlf)
            (printout t "?i:slt   " ?i:slt crlf)
            (printout t crlf)
            (printout t "-------------" crlf)
            (send ?ii print)
            (printout t "?ii:gen " ?ii crlf)
            (printout t "?ii:slt  " ?ii:slt crlf)
            (printout t crlf)))))
CLIPS> (fn1)
=============
[in1] of cl1
(slt in1)
?i:gen  [in1]
?i:slt   in1

-------------
[in1] of cl1
(slt in1)
?ii:gen [in1]
?ii:slt  in1

=============
[in1] of cl1
(slt in1)
?i:gen  [in1]
?i:slt   in2  ;;; --- ERROR should be ins1

-------------
[in2] of cl1
(slt in2)
?ii:gen [in2]
?ii:slt  in2

CLIPS>
***********
RESOLUTION:
***********

In the file INSQYPSR.C in the function ReplaceSlotReference,
replace the following:

while ((eptr == NULL) ? CLIPS_FALSE :
       (strncmp(ValueToString(eptr->value),str,
                (CLIPS_STD_SIZE) i) != 0)

with:

 while (eptr && ((i != strlen(ValueToString(eptr->value))) ||
                 strncmp(ValueToString(eptr->value),str,(CLIPS_STD_SIZE) i)))

*******
STATUS:
*******

FIXED BY            : Brian L. Donnell
DATE                : 8/8/96
IMPLEMENTED BY      : Brian L. Donnell
IN VERSION          : 6.2
DATE                :
DOCUMENTED BY       :
DATE                :
TESTED BY           :
DATE                :
APPROVED BY         :
DATE                :