This is the mail archive of the
xsl-list@mulberrytech.com
mailing list .
Re: question with using Muenchian/xsl:key (Re: sort/group/count problem)
- To: xsl-list at mulberrytech dot com
- Subject: Re: question with using Muenchian/xsl:key (Re: sort/group/count problem)
- From: Mike Brown <mike at skew dot org>
- Date: Sat, 11 Nov 2000 13:05:24 -0700 (MST)
- Reply-To: xsl-list at mulberrytech dot com
Xu, Xiaocun wrote:
> Thanks to Jeni's suggestion, I started to apply Muenchian for grouping.
> It works well, but I have one problem: since xsl:key is top-level element, I
> can not seem to apply element scope with it.
This is *exactly* my problem with xsl:key. The only way to restrict your
key lookup to a certain node-set is to find the intersection of that
node-set and the result of a key lookup across the whole current node's
document.
The "Kaysian Method" of finding node-set intersections is:
$set1[count(.|$set2)=count($set2)]
With your data, the indicated section will be $set1:
<xsl:for-each select="item[count(. | key('items-by-itemid', @itemid)[1]) =1]">
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
And you'll need to prepare a variable for $set2 right before that:
<xsl:variable name="this_lists_items" select="item"/>
So the for-each should look like (and I haven't tested this):
<xsl:for-each select="item[count(.|key('items-by-itemid',@itemid)[count(.|$this_lists_items)=count($this_lists_items)][1])=1]">
Clear as mud, eh?
- Mike
____________________________________________________________________
Mike J. Brown, software engineer at My XML/XSL resources:
webb.net in Denver, Colorado, USA http://www.skew.org/xml/
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list