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RE: Extract unique values

Subject: RE: Extract unique values
From: "SINGH Navpreet" <Navpreet.SINGH@xxxxxxxxx>
Date: Fri, 24 Mar 2006 10:26:52 +1100
xslt unique values
Thanks for your response. Should have used distinct-values() function at
first place.

-----Original Message-----
From: G. Ken Holman [mailto:gkholman@xxxxxxxxxxxxxxxxxxxx]
Sent: Friday, 24 March 2006 9:59 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  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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