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Bug with ProbabilityDistribution


Evaluate this:

	ProbabilityDistribution[
 		Piecewise[{{0, x1 == 1 && x2 == 1}, {1/2, x1 == 1 && x2 == 0}, {0, x1 == 0 && x2 == 1}, {1/2, x1 == 0 && x2 == 0}}],
		 {x1, 0, 1, 1}, {x2, 0, 1, 1}
	 ]
	PDF[%][{1, 1}]

And you get:

	Undefined

But the probability is obviously 0

Is there something I am misunderstanding about how simple Boolean probability distributions should be set up?

Thanks.






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