[rules-dev] feature request: undo-then

[Greg Barton]

--- On Thu, 2/19/09, Geoffrey De Smet <ge0ffrey.spam at gmail.com> wrote:

> What would an "else clause" do?

The else clause(s) could be indexed by condition.  This has been implemented by Dr Forgy's OPSJ.  It looked something like this:

rule
when
1: Foo()
2: Bar()
3: Bas()
then
  //Everything matches
else 3:
  //Foo and Bar match, No Bas
else 2:
  //Foo matches, No Bar, Bas unknown
else 1:
  //No Foo, Bar and Bas unknown
end