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[xsl] hierarchic counting in flat structures


Subject: [xsl] hierarchic counting in flat structures
From: Norbert Heidbrink <nh@xxxxxxxx>
Date: Fri, 2 Nov 2012 11:16:58 +0100

Hi everyone,

given a structure like

<H3>b&</H3>
  <H4>b&</H4>
  <H4>b&</H4>

<H3>b&</H3>
  <H4>b&</H4>

<H3>b&</H3>
  <H4>b&</H4>
  <H4>b&</H4>
  <H4>b&</H4>


I would like to number the H4, re-starting on every H3.
So the output is something like this:

H3: 1
  H4: 1
  H4: 2
H3: 2
  H4: 1
H3: 3
  H4: 1
  H4: 2
  H4: 3

The following xsl does the job, but I wonder if this solution is really
effective and elegant.

<xsl:template match="H4">
  <xsl:text>&#x0a;  H4: </xsl:text>
  <xsl:variable name="myH3" select="preceding-sibling::H3[1]" />
  <xsl:value-of select="1 + count(preceding-sibling::H4[preceding-
sibling::H3 = $myH3])" />
</xsl:template>

Are there better ways to solve my problem?

Best regards and thanks for brainstorming,
Norbert


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