[xsl] Define internal xsl variable

["Susanne Wunsch" <xsl@xxxxxxxxxxxxxxxxx>]

Hello,

I'm Susanne and did already some xsl transformations before. For now I try 
to define an internal xsl variable but the xpath expression doesn't work 
so far.

(The current xsl approach is shown below.)

The 'origin' variable should be mapped into the following node set (in the
'spannedCells' variable):

<t:data>1</t:data>
<t:data>2 3</t:data>
<t:data>4 5 6</t:data>
<t:data>7</t:data>

It shows occupied cells including the "spanned" ones. I think that some
recursive design should be possible but I just didn't find how to start in
this case.

I would be very glad about any hint.

Full xsl file follows:
-------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  xmlns:xs="http://www.w3.org/2001/XMLSchema";
  xmlns:t="http://www.example.org/test"; 
  version="2.0">
    
  <xsl:template name="main">
    <xsl:variable name="origin" as="node()*">
       <t:cell>foo</t:cell>
       <t:cell span="2">bar</t:cell>
       <t:cell span="3">baz</t:cell>
       <t:cell>test</t:cell>
    </xsl:variable>
        
    <xsl:variable name="SpannedCells" as="node()*">
       <t:data>1</t:data>
       <xsl:for-each select="$origin[position() > 1]">
         <xsl:variable name="PreviousValue" 
           select="xs:integer(max(preceding::t:data/text()))"/>
         <xsl:variable name="MaxValue" 
           select="if (./@span) then ($PreviousValue + 1 + @span) 
           else ($PreviousValue + 1)"/>
         <t:data>
           <xsl:value-of select="($PreviousValue + 1) to $MaxValue"/>
         </t:data>    
       </xsl:for-each>
     </xsl:variable>
       
     <xsl:message select="$SpannedCells"/>
  </xsl:template>    
</xsl:stylesheet>
------------------------------------------------------------------------

Thanks and kind regards...
Susanne