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[xsl] Perfomance: 'conditional instruction' vs. 'multi template'

Subject: [xsl] Perfomance: 'conditional instruction' vs. 'multi template'
From: Norbert Heidbrink <nh@xxxxxxxx>
Date: Sat, 3 Nov 2012 16:24:04 +0100

Hi everybody,

if a node is to be processed differently, depending on a certain
condition, there are two approaches.

Let's say, the condition is "existance of child x".

Approach 1: two templates with different matching XPaths

<template match="thenode[child::x]">
  b& do_this b&

<template match="thenode[not(child::x)]">
   b& do_that b&

Approach 2: one template with a conditional instruction

<template match="thenode">
  <xsl:when test="x">
    b& do_this b&
    b& do_that b&

I wonder, if one of these approaches is to be favoured?
Are there any severe implications on performance?
Any other advantages / disadvantages that speak in favour of approach 1
or approach 2?

I am curious to read your estimations,

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