On 12/06/2014, bvoisin <benoit.voi...@igc-erp.com> wrote:
> I did not quite understand your last paragraph on a "representative". Do
> you have an example I could study ?
Given a set of facts that match some constraints, and you want to
accumulate them in some way, this approach appears to achieve it:
Foo( $bar: bar == "bar-x", ... )
accumulate( Foo( bar == $bar,... ); ...; ... )
But, obviously, there is more than one such Foo where bar == "bar-x",
and hence the first CE matches more than once, while the accumulate
may not collect a set that's different each time. Details may vary, of
course, but there's no guarantee that each accumulate will be unique.
In order to have each set of Foo-facts accumulated only once, some
constraint must be exercised on the "trigger" Foo, e.g., making it
unique among all the candidates:
Foo( $id: id, $bar: bar == "bar-x", ... )
not Foo( id < $id, $bar: bar == "bar-x", ... )
accumulate( Foo( bar == $bar,... ); ...; ... )
Now, this particular accumulation occurs only once.
-W
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