Subject: Re: [xsl] Understanding Identity Transformations|
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Sun, 13 Feb 2005 21:46:07 +1100
On Sun, 13 Feb 2005 10:47:26 +0100, Joris Gillis <roac@xxxxxxxxxx> wrote: > Tempore 00:33:56, die 02/13/2005 AD, hinc in > xsl-list@xxxxxxxxxxxxxxxxxxxxxx scripsit Dimitre Novatchev > <dnovatchev@xxxxxxxxx>: > > > One of the most valuable advice from even the first edition of "XSLT > > Programmer's Reference" is always to try to use "not()" and to use > > "!=" only when it is really necessary. > > > > So which would you advise to solve the question? > > "@cat and not(@cat='BLUE')" > > or > "@cat!='BLUE'" Here the two comparison operators are applied on a single node, and evaluating the the above two expressions results in the same boolean values. There is no confusion in using the != operator in this case. In XPath 2.0 one would probably want to use the "ne" value comparison operator, as it's operands can only be single values. Cheers, Dimitre Novatchev.