Re: [xsl] XSL support of Bottom up transformations?

[Owen Rees <owen.rees@xxxxxx>]

--On Wednesday, November 14, 2007 04:28:09 PM +0530 Raghu Narayan 
Koratagere wrote:

> I have specific business requirement where I need to transform the
> source tree bottom up. The reason being certain attribute of the
> parent node gets its value from a similarly caluclated child node. i.e
> I need to calculate a derived attribute of a child node before I can
> calculate the parent node's attribtue.
>
> Is such a requirement be addressed using XSL? If yes any pointers will
> be very helpful.

Is this the sort of thing you mean? Note that this is an XSLT2 transform:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="2.0">
   <xsl:output indent="yes"/>
   <xsl:template match="node()">
       <xsl:variable name="children" as="node()*">
           <xsl:apply-templates/>
       </xsl:variable>
       <xsl:copy>
           <xsl:sequence select="@*"/>
           <xsl:sequence select="($children/@a)[1]"/>
           <xsl:sequence select="$children"/>
       </xsl:copy>
   </xsl:template>
</xsl:stylesheet>

with input

<?xml version="1.0" encoding="UTF-8"?>
<x>
   <y>
       <z a="1" b="1"/>
   </y>
   <y>
       <z a="2" c="2"/>
   </y>
</x>

gives output

<?xml version="1.0" encoding="UTF-8"?>
<x a="1">
   <y a="1">
       <z a="1" b="1"/>
   </y>
   <y a="2">
       <z a="2" c="2"/>
   </y>
</x>

--
Owen Rees; speaking personally, and not on behalf of HP.
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