Re: [xsl] Duplicate Elimination

Subject: Re: [xsl] Duplicate Elimination
From: David Carlisle <davidc@xxxxxxxxx>
Date: Thu, 13 Mar 2014 10:14:38 +0000
On 12/03/2014 23:42, Ihe Onwuka wrote:
As suspected it was possible to avoid grouping. See the predicate
tacked on to B/Date.

Thanks all.

<xsl:apply-templates select="A/Date | B/Date[not(A/Date/text() = text())]>
    <xsl:sort select="." order="ascending"/>

It seems unlikely that that predicate is ever going to be true (unless you have a structure like


but that would sort with the string value of the B element and nested A element, which would be odd.

I suspect you intended

<xsl:apply-templates select="A/Date | B/Date[not(current()/A/Date/text() = text())]>

But unlike muenchian grouping or xsl-for-each (both of which actually have a simpler syntax than this) this will (unless you have a very aggressively optimising XSLT engine) be quadratic in performance as the full A list is going to be searched for every B.

Also of course using text() rather than

<xsl:apply-templates select="A/Date | B/Date[not(current()/A/Date = .)]>

means the code is very fragile and will break if comments spit up the text nodes.


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