On 21 February 2011 22:03, Ansgar Konermann <ansgar.konermann@googlemail.com> wrote:

If insertLogical did introduce duplicate objects, we'd need this:

when
exists edge(a, b)
exists reach(b, c)

then
insertLogical( reach(a,c) )

You cannot write this because it's not possible to use variables bound within an exist CE outside this context. Even if you omit the first exists, then c from the second exists is not available.

-W

Kind regards

Ansgar
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