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RE: [xsl] Optimizing identity template

2009-01-22 04:33:58

 1. load an external SVG file ($basemap).
 2. copy entire SVG file, adding <circle> as the last element

I would do:

<xsl:template match="svg:svg">
  <xsl:copy>
    <xsl:copy-of select="child::node()"/>
    <svg:circle
               cx="100px" cy="100px" r="5px"
               fill="#ff0000" stroke="#000000" stroke-width="1px"/>
  </xsl:copy>
</xsl:template>

No need to apply-templates all the way down the tree if all you want is a
straight copy.

And a match with the predicate [position()=last()] is potentially very
expensive, though Saxon optimizes it.

Michael Kay
http://www.saxonica.com/



 This is for PHP5/libxslt, but there will also be an XSLT 
2/Saxon version.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:svg="http://www.w3.org/2000/svg";>

        <xsl:output method="xml" omit-xml-declaration="no" 
indent="yes" encoding="UTF-8"/>
   
        <xsl:template match="/">
                <xsl:apply-templates 
select="document($basemap)/svg:svg"/>
        </xsl:template>
        
        <xsl:template match="/svg:svg/*[position()=last()]">
                <xsl:copy>
                        <xsl:apply-templates select="@*|node()"/>
                </xsl:copy>
                <circle xmlns="http://www.w3.org/2000/svg";
                cx="100px" cy="100px" r="5px"
                fill="#ff0000" stroke="#000000" stroke-width="1px"/>
        </xsl:template>
        
        <xsl:template match="node()|@*">
                <xsl:copy>
                        <xsl:apply-templates select="@*|node()"/>
                </xsl:copy>
        </xsl:template>

</xsl:stylesheet>

--
Best regards,
Jacek Iwański
jiva(_at_)ceti(_dot_)pl


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