What you are looking for is the capability of using interface names as
template names in LHS code, which is not available in Jess.

Using "extends" might help you to a certain extent, but that's
restricted to the definition of a hierarchy.

Also, consider that the solution to your problem might be a completely
different approach to structuring your facts.


On 26/07/2013, Aurelien Mazurie <ajmazu...@oenone.net> wrote:
> 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
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