[ZPT] TAL: What does "action cancellation" mean?

[Alan Kennedy]

Dear ZPTers,

I've been reading the TAL spec in some detail, and I can't 
figure out what "action cancellation" means.

For example, under the paragraph for "Condition" appears 
the following:

"It is up to the interface between TAL and the expression 
engine to determine the value of 'true' and 'false'. For 
these purposes, the value 'nothing' is false, and 
cancellation of the action has the same effect as returning 
a true value".

Can anyone provide an example which illustrates the meaning 
of "cancellation of the action", in this context or any 
other context?

Regards, and Happy St. Patrick's Day to all (on Sunday).

Cheers,

Al.


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