Pat Turner <purpletrousers@n...> writes:

> Thanks David,
> 
> errrm, could you give me an example of what the first pass stylesheet 
> would look like using my example? I can't think how it would be done.
> 
> TIA
> Pat

several ways, depending how generic/efficient you want to be.

for example

input doc (eval.xml):

<family>
	<person name="bob">
		<father ref="../../person[2]" />
	</person>
	<person name="charlie">
		<child ref="../../person[1]" />
	</person>
</family>


proto-stylesheet (eval1.xsl)


<xsl:stylesheet	version="1.0"
xmlns:x="data:,x"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">


<xsl:template mode="a" match="person">
  <xsl:value-of select="@name"/>
</xsl:template>

<xsl:template match="person">
Person:  <xsl:value-of select="@name"/>
         <xsl:apply-templates select="father|child"/>
</xsl:template>

<xsl:template x:match="father">
Father: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" x:select="@ref"/>
</xsl:template>

<xsl:template x:match="child">
Child: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" x:select="@ref"/>
</xsl:template>

</xsl:stylesheet>


in the above the syntax (which I just made up) is that templates
depending on a generated xpath use x:match in their match pattern, and
use x:select where they want the xpath to appear. This could be made
more efficient (i generate all templates for all dynamic xpaths which is
less code for me to write but generates more templates than needed)



Evaluation stylesheet (this has original source doc filename hardcoded,
it could be a parameter)

<xsl:stylesheet	version="1.0"
xmlns:x="data:,x"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">


<xsl:template mode="a" match="person">
  <xsl:value-of select="@name"/>
</xsl:template>

<xsl:template match="person">
Person:  <xsl:value-of select="@name"/>
         <xsl:apply-templates select="father|child"/>
</xsl:template>

<xsl:template x:match="father">
Father: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" x:select="@ref"/>
</xsl:template>

<xsl:template x:match="child">
Child: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" x:select="@ref"/>
</xsl:template>

</xsl:stylesheet>







generate real stylesheet
saxon -o eval2.xsl eval1.xsl eval.xsl

eval2.xsl has several templates expanded out. and looks like

<?xml version="1.0" encoding="utf-8"?><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:x="data:,x" version="1.0">


<xsl:template mode="a" match="person">
  <xsl:value-of select="@name"/>
</xsl:template>

<xsl:template match="person">
Person:  <xsl:value-of select="@name"/>
         <xsl:apply-templates select="father|child"/>
</xsl:template>


<xsl:template match="father[@ref='../../person[2]']">
Father: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" select="../../person[2]"/>
</xsl:template>
<xsl:template match="father[@ref='../../person[1]']">
Father: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" select="../../person[1]"/>
</xsl:template>


<xsl:template match="child[@ref='../../person[2]']">
Child: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" select="../../person[2]"/>
</xsl:template>
<xsl:template match="child[@ref='../../person[1]']">
Child: <xsl:value-of select="@name"/>
         <xsl:apply-templates mode="a" select="../../person[1]"/>
</xsl:template>

</xsl:stylesheet>



run this stylesheet on original source:

$ saxon eval.xml eval2.xsl
<?xml version="1.0" encoding="utf-8"?>

Person:  bob
Father: charlie

Person:  charlie
Child: bob