Thanks for your response. Should have used distinct-values() function at
first place.
-----Original Message-----
From: G. Ken Holman [mailto:gkholman(_at_)CraneSoftwrights(_dot_)com]
Sent: Friday, 24 March 2006 9:59 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] Extract unique values
At 2006-03-24 09:46 +1100, SINGH Navpreet wrote:
I want to extract all the <c> from the following xml with uniqe
values. So in the transformed, no two <c> element should have same
values.
This is a FFFFFFAQ. Finding uniqueness is a subset of the grouping
problem, so search the web for XSLT Grouping.
In our XSLT 1 training classes we teach that there are three ways to
find uniqueness: using axes, using keys (the Muenchian method)
http://www.jenitennison.com/xslt/grouping/, and using variables
http://www.biglist.com/lists/xsl-list/archives/200401/msg00070.html
... each with pros and cons:
Axis method:
- cons - slow, only sibling-wide or document-wide contexts
Key method:
- pros - fastest, filtering done in predicates
- cons - document-wide context
Variable method:
- pros - document wide, sub-document, or multi-document contexts
- faster than axis method
- cons - slower than key method
- filtering not done in predicates
Grouping is built in to XSLT 2 as a language feature.
I hope this helps.
. . . . . . . . Ken
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