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[xslt] issue with xsltSetDebuggerCallbacks and xslDropCall

Hi all,
I'm using the xsltSetDebuggerCallbacks functionality to implement a 
debugger for xslt. However I've noticed that in certain circumstances 
the xslDropCall callback isn't being called when I think it should be.

for example - with the following simple stylesheet:

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0">

<xsl:template match="/">
   <html>
           <xsl:apply-templates select="//Order"/>
   </html>
</xsl:template>
 
<xsl:template match="Order">
   <h1>Order is:  <xsl:value-of select="@Name"/></h1>          <xsl:text>
</xsl:text>
</xsl:template>

</xsl:stylesheet>

xslAddCall is called when the Order template is matched however 
xslDropCall isn't called upon leaving the stylesheet. xslAddCall is 
correctly called for ever <Order> element in the input document but 
xslDropCall  isn't. It is correctly called with some other stylesheets 
I've been using but I haven't yet narrowed down what the difference is.

Is there some other way to determine when execution has left a given 
template or is this a bug ?

Ian
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