[XSL-LIST Mailing List Archive Home]
[By Thread]
[By Date]
On 02/11/2012 14:25, Dimitre Novatchev wrote:
count(distinct-values(//Websites/*))+1
returns the same value for all the nodes in
//Websites/*
which means working out that (a) all the results in //Websites/* are nodes in the same document, and (b) the expression count(distinct-values(//Websites/*))+1 is dependent on the context document but not on the context item.
Saxon has been able to do that for years, but there are many XPath engines, smaller and lighter than Saxon, that don't attempt anything near this level of analysis.
Re: [xsl] [Summary] Three ways to express in XPath that there are no duplicates in a list of items
Subject: Re: [xsl] [Summary] Three ways to express in XPath that there are no duplicates in a list of items From: Michael Kay <mike@xxxxxxxxxxxx> Date: Fri, 02 Nov 2012 15:35:19 +0000 |
On 02/11/2012 14:25, Dimitre Novatchev wrote:
Either way it requires the optimizer to work out that
I believe that it we re-write this in a more specific form then it wouldn't be so optimizer specific:
not(//Websites/*[position() = count(distinct-values(//Websites/*))+1])
or does this require the same degree of cleverness than the previous expression does?
count(distinct-values(//Websites/*))+1
returns the same value for all the nodes in
//Websites/*
which means working out that (a) all the results in //Websites/* are nodes in the same document, and (b) the expression count(distinct-values(//Websites/*))+1 is dependent on the context document but not on the context item.
Saxon has been able to do that for years, but there are many XPath engines, smaller and lighter than Saxon, that don't attempt anything near this level of analysis.
Michael Kay Saxonica
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [xsl] [Summary] Three ways to e, Dimitre Novatchev | Thread | [xsl] hierarchic counting in flat s, Norbert Heidbrink |
Re: [xsl] [Summary] Three ways to e, Dimitre Novatchev | Date | Re: [xsl] XSLT whitebox testing, Florent Georges |
Month |
Keywords