RE: JESS: multiple bindings of a multislot

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: [email protected] [mailto:[email protected]] 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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