Re: [xsl] Extract unique values

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

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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