Subject: Re: [xsl] Understanding Identity Transformations From: David Carlisle <davidc@xxxxxxxxx> Date: Sun, 13 Feb 2005 13:47:08 GMT |
>So which would you advise to solve the question? > > "@cat and not(@cat='BLUE')" > > or > "@cat!='BLUE'" (Almost) Never used != if one or both arguments is a node set. Even in those cases where it does do what you want, you have to think so hard each time to convince yourself that's what you mean, that it always ends uo makin the stylesheet harder to debug later. If A is a node set with two or more nodes that are not string-equal then A != x is always true for any value of x. This is an entirely logical result of the fact that infix operators so an "if exists" over the whole node set, but it's so rarely what you want that I try to avoid != as much as possible. David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________
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