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Sjoerd ZonneveldSubject: XSL:SORT using variables
Author: Sjoerd Zonneveld
Date: 17 Dec 2001 08:27 AM

I am trying to create a stylesheet with a default sortorder (xsl:sort select='.') but like to dynamically change this into any acceptable Xpath query. Is this possible?

<xsl:for-each select="//mytag">
<xsl:sort select="$a1"/>
<xsl:sort select="$a2"/>

I know the xpath queries, I feed it, are correct. Still it doesn't seem to work.

Anybody have any idea?

Consulting Engineer
eXcelon Corperation

Minollo I.Subject: Re: XSL:SORT using variables
Author: Minollo I.
Date: 17 Dec 2001 10:50 AM
I may be wrong, but I don't think there is any way in XSLT 1.0 to do what
you are asking. The xsl:sort select expression is recomputed N times with
the proper context; unfortunately variables are expressions that have
always the same value once that value is computed. So, doing something like
what you are trying will just sort against a constant value.

The only tricky solution that comes to my mind is doing something like this:

{xsl:variable name="sortkey" select="'title'"/}
{xsl:for-each select="books/book"}
{xsl:sort select="./*[name()=$sortkey]"/}

I believe that the eXcelon XIS XSLT processor has extended the xsl:sort
command adding an "expr" attribute (the same has been done in a bunch of
other contexts) which basically does a double evaluation on the specified
value, allowing variables as re-computed expressions. This is an XIS
specific extension, and you may want to read the XIS documentation for
further details.


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