Re: [xsl] Identity Transform

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Abie,

At 04:28 PM 9/22/2003, you wrote:
> why does the standard identity transform use copy instead of copy-of?

Since it proceeds down the tree step by step, it is a trivial matter to 
amend the identity transform with your own tree-tweaking logic:

<xsl:template match="/ | @* | node()">
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>

<xsl:template match="broken">
  <fixed>
    <xsl:apply-templates select="@* | node()"/>
  </fixed>
</xsl:template>

Put these two together and you get a stylesheet which takes arbitrary input 
and returns it as the result -- except all <broken> elements, at any level, 
are now <fixed>.

The copy-of method is, of course, more efficient if you actually need to 
clone a subtree, rather than copy-it-mostly-except, which is what most 
applications of an identity transform actually need to do.

Cheers,
Wendell

> ie:
>  <xsl:template match="/ | @* | node()">
>    <xsl:copy>
>      <xsl:apply-templates select="@* | node()"/>
>    </xsl:copy>
>  </xsl:template>
>
> instead of just
>  <xsl:template match="/">
>    <xsl:copy-pf select="."/>
>  </xsl:template>


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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