RE: [xsl] Optimizing identity template

["Michael Kay" <mike@xxxxxxxxxxxx>]

>  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 Iwaqski
> jiva@xxxxxxx