Subject: Re: [xsl] If/then/else confusion From: Mark Wilson <mark@xxxxxxxxxxxx> Date: Tue, 25 Dec 2012 20:20:21 -0700 |
Thanks again for your help on a holiday, Best of the new Year, Mark
Hello Liam, Ken, and Syd:
Thanks so much for your input - I was looking at the thing all wrong -- 20 years of C++ coding really prejudices one's view of if-then-else. Once explained, it makes perfect sense.
Thank you all for you help.
I don't celebrate Christmas, but do wish those of you who do a most merry holiday.
Regards, Mark On 12/25/2012 1:43 PM, Liam R E Quin wrote:On Tue, 2012-12-25 at 13:14 -0700, Mark Wilson wrote:Thanks for the info Syd.
I am using XSLT2, which I should have said in the original posting.Mark, the difference between if (Prefix != 'A') then 1 else 2 and if (Prefix = 'A') then 2 else 1 is the case where there's no prefix element, as in the last case in your set of examples.
$A != $B, for two nodelists, means, there's some pair of elements a and b for which the value of a is not equal to the value of b So if $A is empty, there is no such value, and it's false.
$A = $B means there's some pair of values a and b whose values are equal one with another. So if $A is empty, $A = $B is false.
not($A != $B) is true when $A is the empty sequence. $A = $B is false when $A is the empty sequence.
Decide which you want and code accordingly :-)
Liam
-- Mark Wilson Knihtisk Publishing
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