[rules-users] Decision Table column testing for exists

[Hrumph]

Hi.   I'm trying to figure out how to express a Condition that does the
following:

Column name:   FeV1 exists
Possible values:   true, false, n/a

I wish to test for the existence of an FeV1 fact and have a different
condition in the rule generated, as follows:

true, generates 'exists FeV1()'
false, generates 'not FeV1()'
n/a, generates nothing

Is there some way to do this?

Thanks,

Herm



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