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keys vs templates

From: Andy Chambers <achambers.home@----------.--->
To: NULL
Date: 8/2/2008 1:44:00 PM

Hi,

I'm generating a stylesheet that will transform all instances of

<xref ref="001"/>

in a document into a fragment like

<ul>
  <li>one</li>
  <li>two</li>
</ul>

I see two ways of doing this....

1. Define the expansions in a result tree fragment and use a key to
get fast access to the correct expansion Then a single xref match
template looks up the variable using the key to get the appropriate
expansion

<xsl:key name="xdefs" match="xdef" use="id"/>

<xsl:variable name="expansions">
<expansions>
  <xdef id="001">
     <ul>
       <li>one</li>
      <li>two</li>
    </ul>
  </xdef>
</expansions>
</xsl:variable>

2. Define a match template for each expansion

<xsl:template match="xref[@ref='001']">
  ...
</xsl>

<xsl:template match="xref[@ref='002']">
  ..
</xsl>


Is one of these approaches better in terms of performance than the
other?  Does it make a difference which processor is used?

Cheers,
Andy

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keys vs templates