Thank you; the template inheritance mechanism was the answer. Aurélien On Jul 30, 2013, at 8:11 AM, "Friedman-Hill, Ernest" <ejfr...@sandia.gov> wrote:
> The short answer is “no”. Templates are like Java classes, and so this is > akin to asking if you can write Java code that reads the value of a “score” > member variable in any class. > > But you can use template inheritance to achieve your goal. Templates can > extend other templates; just put your “score” slot in a base template, and > extend everything else that needs a “score” slot from that common base, and > write your patterns to match the base template. Read about the use of > “extends” in templates here: > > http://www.jessrules.com/jess/docs/71/memory.html > > > From: owner-jess-us...@sandia.gov [mailto:owner-jess-us...@sandia.gov] On > Behalf Of Aurelien Mazurie > Sent: Friday, July 26, 2013 4:43 PM > To: jess-users > Subject: JESS: [EXTERNAL] Matching facts based on a slot, but not the fact's > type > > Dear Jess users, > I am still learning the ropes, and cannot find an answer to the following > question either online or in the 'Jess in action' book. Is there a way to > match facts in a LHS based on the presence of a slot? > > For example, I have two templates: > > (deftemplate A (slot score)) > (deftemplate B (slot score)) > > I would like my rule to be triggered if any fact (either from template A, B, > or others) have a 'score' slot with a specific value. For now I can do it by > manually adding references to A and B in the LHS, but this will not scale > well. I'm looking for a solution that can just work on any fact, regardless > of the template they are defined from. > > Best, > Aurelien
