Re: [xsl] Selecting non-duplicate nodes

[Michael Müller-Hillebrand <mmh@xxxxxxxxxxxxx>]

Am 12.10.2011 um 17:33 schrieb Mark:

> My question now is: how can I change this stylesheet so that for the listed
input, no <FormatButtons> in the output contains more than one copy of a
<Format> with the same attribute name and value? That is, where the current
output is, for example:
>
> <FormatPage souvenir-sheet="365">
>  <FormatButtons>
>    <Formats se-tenant="365"/>
>    <Formats se-tenant="365"/>
>    <Formats coupon="367"/>
>    <Formats coupon="368"/>
>  </FormatButtons>
> </FormatPage>

Mark,

If a node in your sample is a duplicate of another node can be retrieved from
the attribute names and their values. So IMO the grouping key could be a
serialization of them. In other words, we look at the source as if we were a
text processor, like this:

<xsl:template match="FormatButtons">
  <xsl:copy>
    <xsl:for-each-group select="Formats"
        group-by="string-join(
          for $i in 1 to count(@*)
            return concat(name(@*[$i]), '=', @*[$i]), ' ')">
      <xsl:apply-templates select="."/>
    </xsl:for-each-group>
  </xsl:copy>
</xsl:template>

In XML the order of attributes is usually irrelevant, but the above solution
does not ignore order. But it works with any number of attributes.

- Michael M|ller-Hillebrand

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Michael M|ller-Hillebrand: Dokumentation Technology
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