[QTI] QTI multiple response question with empty answer

[Bart Nagel]

At 2009-11-25 22:23:34 +0530, vijay.adyanthaya at wipro.com wrote:
> the only option is to add one more key which says "None of the above"

I see -- but isn't that rather silly? The engine would render that 
also as a checkbox, meaning it's possible for someone to tick "none of 
the above" as well as other boxes.

Seems to me that the specification ought to allow for this.

--bart nagel
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