> <xsl:when test="not(string-length($graph/@type) = 0)">

Here you are treating the variable $graph as a nodeset, when it is only
a string.


 <xsl:template name="drawGraph"> 
  <xsl:variable name="graph" select="." /> 
  <xsl:param name="type"> 
   <xsl:choose> 
    <xsl:when test="not(string-length($graph/@type) = 0)"> 
     <xsl:value-of select="$graph/@type" /> 
    </xsl:when> 
    <xsl:otherwise> x-y</xsl:otherwise>
   </xsl:choose> 
  </xsl:param> 
  <type> 
   <xsl:value-of select="$type"/> 
  </type> 
 </xsl:template> 

You can just drop $graph here and use @type on its own, as the current
node will always be '.'

I understand this is a fictional example, but wouldnt you just need:

 <xsl:template name="drawGraph"> 
   <xsl:choose> 
    <xsl:when test="string-length(@type)"> 
     <xsl:value-of select="@type" /> 
    </xsl:when> 
    <xsl:otherwise> x-y</xsl:otherwise>
   </xsl:choose> 
 </xsl:template> 

This will produce the same results as the above template.

cheers
andrew

>  -----Original Message-----
>  From: Ryan Beesley [mailto:RBeesley@[...].org]
>  Sent: 14 October 2002 09:42
>  To: xsl-list@[...].com
>  Subject: [xsl] Error xsl:param may not be used here
>  
>  
>  I know that this error has been addressed on this list 
>  before, but I don't
>  think it has been answered in this context.
>  
>  I have been working on a set of svg graphing (xslt) utilities 
>  that I'd like
>  to make publically available once my senior design project is 
>  complete, but
>  I've run into a slight snag.  I wanted to be able to 
>  customize different
>  parameters in multiple ways.  Below is listed a small segment 
>  of my xml and
>  xslt.
>  
>  ---- graph.xml ----
>  <?xml version="1.0" encoding="UTF-8"?>
>  <graph type="pie">
>   <!-- Graph data goes here -->
>  </graph>
>  
>  ---- graph.xslt ----
>  <?xml version="1.0" encoding="UTF-8"?>
>  <xsl:stylesheet version="1.0"
>  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>   <xsl:output method="xml" version="1.0" encoding="UTF-8" 
>  indent="yes"/>
>  
>   <xsl:template match="graph">
>    <xsl:call-template name="drawGraph">
>     <!-- Optional parameters to alter graph -->
>     <xsl:with-param name="type" select="'bar'"/>
>    </xsl:call-template>
>   </xsl:template>
>  
>   <xsl:template name="drawGraph">
>    <xsl:variable name="graph" select="." />
>    <xsl:param name="type">
>     <xsl:choose>
>      <xsl:when test="not(string-length($graph/@type) = 0)">
>       <xsl:value-of select="$graph/@type" />
>      </xsl:when>
>      <xsl:otherwise>x-y</xsl:otherwise>
>     </xsl:choose>
>    </xsl:param>
>    <type>
>     <xsl:value-of select="$type"/>
>    </type>
>   </xsl:template>
>  
>  </xsl:stylesheet>
>  
>  ---- output.xml ----
>  <?xml version="1.0" encoding="UTF-8"?>
>  <type>bar</type>
>  
>  Although you would probibly never include a parameter in both 
>  the calling
>  template and the xml data, I have included both to 
>  demonstrate the use.  The
>  passed template param should win however.  When evaluating 
>  this with XML
>  Spy, in debug mode, it works exactly as I want it too.  I can 
>  change the
>  value of @type either while calling the template, or directly 
>  from the xml
>  data.  If neither parameter was provided, the template 
>  assumes a default.
>  
>  Xalan and MSXML fail completely.  If I place my params inside 
>  the choose,
>  then they aren't recognized, as should be, but it doesn't 
>  seem to like my
>  nested choose for the param either.  I suspect that this 
>  structure is the
>  source of my error: xsl:param may not be used here.
>  
>  If anyone has suggestions as to how I can make this work, I'm 
>  always eager
>  to learn.  I believe I could use a variable to make this 
>  work, but then I
>  wouldn't be able to change it from the template, right?
>  
>  Ryan Beesley
>  Rbeesley@[...].org
>  Founder, Atum Innovations
>  
>  
>  
>   XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
>  
>  
>  
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