Subject: RE: question with using Muenchian/xsl:key (Re: sort/group/count p robl em) From: Xiaocun Xu <XXu@xxxxxxxxxxxxxxxxxx> Date: Sat, 11 Nov 2000 19:48:38 -0500 |
Thanks for the suggestion, Mike. Yeah, it is indeed clear as mud :) I kind of understood the find node-set intersection method: if the current node is part of the same parent, then count(.|$set2)=count($set2). Since my goal is to find the sum of @units for all items with the same @itemid under the same itemlist parent, I tried: sum(item[count(.|key('items-by-itemid',@itemid)[count(.|$this_lists_ items)=count($this_lists_items)][1])=1]/@units) which returned me "0". Is this the right way to find the sum of the node-set intersect? I also tried the normal (inefficient) way of using two XPath: <xsl:for-each select="item[not(@itemid = preceding-sibling::item/@itemid)]"> <td class="text" width="48%"><xsl:value-of select="@itemid"/></td> <td class="text-right" width="6%"><xsl:value-of select="sum(item[@itemid = current()/@itemid]/@units)"/></td> </xsl:for-each> That also returned me a sum of 0, is there something wrong with my calculation of sum? Much thanks, Xiaocun -----Original Message----- From: Mike Brown To: xsl-list@xxxxxxxxxxxxxxxx Sent: 11/11/00 3:05 PM Subject: Re: question with using Muenchian/xsl:key (Re: sort/group/count probl em) 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 XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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