Subject: Re: [xsl] Duplicate Elimination|
From: Ihe Onwuka <ihe.onwuka@xxxxxxxxx>
Date: Thu, 13 Mar 2014 12:11:07 +0000
On Thu, Mar 13, 2014 at 11:56 AM, David Carlisle <davidc@xxxxxxxxx> wrote: > On 13/03/2014 11:38, Ihe Onwuka wrote: >> >> By all means reply but from an educational perspective point out that >> your preference for for-each-group, has no set-theoretic >> interpretation, > > > It's iterating through representatives of the quotient set if you factor > by the relation implied by the group-by clause. > A union (B difference A). People who speak English will understand that. > >> will not work for anybody restricted to XSLT 1.0 > > > It's easy to rewrite any such use of for-each-group as xsl-for-each plus > a filter using a key (look up muenchian grouping for the details) > Easy for who? Where's that quote from Mike Kay that use of xsl:key should be common knowledge in XSLT development - which obviously suggests that it is not. >> and does not port to XPATH or XQuery. > > > For xquery you can use the similar group-by clause so long as you > are using V3 http://www.w3.org/TR/xquery-30/#id-group-by > For the cognoscenti who have access to 3.0 processors, the same group of people that almost have nothing to learn from reading any of this.