Re: Dynamic include

On Thursday 12 September 2002 03:25, Cédric Claus wrote:
> Now I want to do a dynamic include depending on a tag of  my XML document.
> For example:
>     xml: <include>page1.xsl<include>
>     principal.xsl : <xsl:include><xsl:attribute name="href"><xsl:valueof
> select"include"/></xsl:attribute></xsl:include>

I see a couple options, probably not the only ones:

* If you can make your processor support it, use the <?xml-stylesheet?> 
processing instruction to point to an XSL file that includes the custom 
stylesheet and also the principal stylesheet.  The processing-instruction 
replaces the <include> tag.

For example:

+ In your XML:
  <?xml-stylesheet href="include-page1.xsl"?>
  <other-tags>
    ...
  </other-tags>

+ In include-page1.xsl:
  <xsl:stylesheet ...>
    <xsl:include href="path/to/principal.xsl"/>
    <xsl:template name="custom-processing-for-page1">
      ...
    </xsl:template>
  </xsl:stylesheet>


* Or, why not make the source XML with the <include> tag into a stylesheet of 
its own?  This will involve two stages of processing: the first outputs a 
stylesheet containing only the <xsl:include> elements, and the second uses 
the newly generated stylesheet to re-process the data using the included 
stylesheets.  For example:

+ Output from first stage:
  <xsl:stylesheet ...>
    <xsl:include href="principal.xsl"/>
    <!-- taken from <include> element -->
    <xsl:include href="page1.xsl"/>
  </xsl:stylesheet>

+ Second stage uses the first stage's output stylesheet, and processes the 
input XML again (this time ignoring the <include> element).

It should be possible to optimize the two stages to keep from parsing the 
source XML twice, by reusing the DOM tree if the data will fit into RAM.

HTH

-- 
Peter Davis

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