Yes, reopening a slot like this is an error; this behavior was inherited from
CLIPS.
I can't think of any particularly elegant workarounds. You can name those
anonymous multifields and refer to them later in the rule, though -- i.e.,
(Temp (m $?first one two $?rest)
?first and ?rest can be used elsewhere in the same rule to refer to what
came before and after one two.
From: owner-jess-us...@sandia.gov [mailto:owner-jess-us...@sandia.gov]
On Behalf Of Wolfgang Laun
Sent: Sunday, August 14, 2011 2:30 PM
To: jess-users
Subject: JESS: multiple bindings of a multislot
Given
(deftemplate Temp (multislot m))
Cursory tests seem to indicate that a Temp pattern may be written with
just a single set of clusters consisting of '?', '$?' and their named cousins.
As an example, it's possible to write
(Temp (m $? one two $?))
but not
(Temp (m $? one two $?)(m $?mvals))
to ascertain that one and two occur as indicated and to bind ?mvals
to the entire list.
There is, of course, the workaround to use (Temp) once more, making
sure that the facts are the same, but this is rather a lot to write for a
relatively simple thing.
Is it correct that one (multi)slot cannot be used more than once in a
single pattern (except as a variable between braces)?
-W
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