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AW: [xsl] comparing attributes if missing at times


Subject: AW: [xsl] comparing attributes if missing at times
From: "Szabo, Patrick (LNG-VIE)" <patrick.szabo@xxxxxxxxxxxxx>
Date: Wed, 26 Mar 2014 14:19:57 +0000

Thanks all for your fast responses.



. . . . . . . . . . . . . . . . . . . . . . . . . .
Ing. Patrick Szabo
Developer
LexisNexis
A-1030 Wien, Marxergasse 25

mailto:Patrick.Szabo@xxxxxxxxxxxxx
Tel.: +43 1 53452 1514
Fax.: +43 1 534 52 146

. . . . . . . . . . . . . . . . . . . . . . . . . .



. . . . . . . . . . . . . . . . . . . . . . . . . .
Ing. Patrick Szabo
Developer
LexisNexis
A-1030 Wien, Marxergasse 25

mailto:Patrick.Szabo@xxxxxxxxxxxxx
Tel.: +43 1 53452 1514
Fax.: +43 1 534 52 146

. . . . . . . . . . . . . . . . . . . . . . . . . .

-----Urspr|ngliche Nachricht-----
Von: Michael Kay [mailto:mike@xxxxxxxxxxxx]
Gesendet: Mittwoch, 26. Mdrz 2014 14:13
An: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Betreff: Re: [xsl] comparing attributes if missing at times


On 26 Mar 2014, at 12:41, Szabo, Patrick (LNG-VIE)
<patrick.szabo@xxxxxxxxxxxxx> wrote:
:
>
> <xsl:for-each-group select="elem" group-starting-with="elem[@x !=
preceding-sibling::elem[1]/@x]">

Like all the other comparison operators, "!=" is implicitly existential. That
is, A!=B means "some a in A, b in B satisfies a!=b".

This is handy for "=", because you can say author="Smith" and it gives a
reasonable answer if there is more than one author.

It's very rarely useful for "!=", which is why most people advise against
using it. Use not(A = B) instead,

Michael Kay
Saxonica


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