XSLT and python

Hi all,
I am using python2.2 and trying to convert an xml document into a plain
text using a stylesheet and using python standard xmlplus package.
While the stylesheet perfectly works with a similar approach in cpp, I'm
facing a problem in python when parsing  some "range" values:

here follows the piece of code inside the stylesheet regarding range
values:

[...]
<!-- LowerBoundedRange types -->
<xsl:template match="jsdl:LowerBoundedRange">
  <xsl:param name="VARNAME"/>
  <xsl:value-of select="$VARNAME"/>
  <xsl:choose>
    <xsl:when test="@jsdl:exclusiveBound='true'">
       <xsl:text> &gt; </xsl:text>
    </xsl:when>
    <xsl:otherwise>
       <xsl:text> &gt;= </xsl:text>
    </xsl:otherwise>
  </xsl:choose>
  <xsl:value-of select="."/>
</xsl:template>
[...]


and here the piece of code where the exception arises:


[...]
processor = Processor()
processor.appendStylesheetUri(xsltFile)
processor.runUri(jsdlFile)



here the exception I get:

[grid] /home/maraska/Jsdl/python > ./jsdl.py jsdl2jdl.xslt 
jsdl_rask.xml
Traceback (most recent call last):
  File "./jsdl.py", line 58, in ?
    print jsdl.applyXSLT()
  File "./jsdl.py", line 45, in applyXSLT
    return self.processor.runUri(self.jsdlFile)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Processor.py",
line 175, in runUri
    writer, uri, outputStream)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Processor.py",
line 283, in execute
    self.applyTemplates(context, None)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Processor.py",
line 304, in applyTemplates
    found = sty.applyTemplates(context, mode, self, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Stylesheet.py",
line 452, in applyTemplates
    template.instantiate(context, processor, params)
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/TemplateElement.py",
line 117, in instantiate
    context = child.instantiate(context, processor)[0]
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/ApplyTemplatesElement.py", line 86, in instantiate
    processor.applyTemplates(context, mode, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Processor.py",
line 304, in applyTemplates
    found = sty.applyTemplates(context, mode, self, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Stylesheet.py",
line 452, in applyTemplates
    template.instantiate(context, processor, params)
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/TemplateElement.py",
line 117, in instantiate
    context = child.instantiate(context, processor)[0]
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/ForEachElement.py", line
64, in instantiate
    child.instantiate(context, processor)[0]
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/ApplyTemplatesElement.py", line 86, in instantiate
    processor.applyTemplates(context, mode, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Processor.py",
line 304, in applyTemplates
    found = sty.applyTemplates(context, mode, self, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Stylesheet.py",
line 452, in applyTemplates
    template.instantiate(context, processor, params)
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/TemplateElement.py",
line 117, in instantiate
    context = child.instantiate(context, processor)[0]
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/ApplyTemplatesElement.py", line 86, in instantiate
    processor.applyTemplates(context, mode, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Processor.py",
line 304, in applyTemplates
    found = sty.applyTemplates(context, mode, self, params)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xslt/Stylesheet.py",
line 452, in applyTemplates
    template.instantiate(context, processor, params)
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/TemplateElement.py",
line 117, in instantiate
    context = child.instantiate(context, processor)[0]
  File
"/usr/lib/python2.2/site-packages/_xmlplus/xslt/ValueOfElement.py", line
40, in instantiate
    result = self._expr.evaluate(context)
  File "/usr/lib/python2.2/site-packages/_xmlplus/xpath/ParsedExpr.py",
line 95, in evaluate
    expanded[0], expanded[1])
xml.xpath.RuntimeException: Variable undefined: ("None", "VARNAME").


Any chance you have got an idea? Thank you in advance for your support!


cheers,
Alessandro


-- 
-----
Alessandro Maraschini
Grid R&D Group
Government and Institutions Division

DATAMAT S.p.A. - a Finmeccanica company
Via Laurentina, 760 B- I - 00143 Rome B- Italy
http://www.datamat.it

mailto: alessandro.maraschini@xxxxxxxxxx
phone:    +39 06 5027 4501 (direct)  
          +39 06 5027 2211 (secretary)
fax:      +39 06 5027 4330