Need if/unless features

I would like to be able to have something similar to the if/unless

attributes for the <target> tag, which causes the if/unless gating

to happen before any of the dependent targets are evaluated.

There are cases where I do know that I don't want a target, or any

of its dependent targets to be evaluated, if a certain condition

is true.

I'm having some trouble coming up with good names for these attributes.

My favorites though:

if_a_priori

unless_a_priori

Also, in both cases, it would be very useful to have the ability to

have compound conditions, joined with 'and' or 'or', etc.

if_a_priori="TheSkyIsNotFalling" unless_a_priori="AlreadyDidAllThis" if="X or Y" unless="(A and B) or C"

Currently, what happens when you have an if and an unless in the

same target? Is it allowed. Are the 2 conditions "anded" or "ored"?

Jason

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