cannot convert a tree fragment in noodelist function

[Marc Salvetti]

hello,
i'm trying to write a template to convert a html table to pdf
the problem is that the table-fo structure need the table columns to be 
declared beforehand.
so i want to find the line of the table with the maximum number of cells 
(because of eventual colspan columns) and transform it in columns 
declaration.

my template look like this :
 <xsl:template match="table">
   <fo:table>
       <xsl:if test="@cellspacing!=''">
           <xsl:attribute name="border-spacing"><xsl:value-of 
select="@cellspacing"/></xsl:attribute>
       </xsl:if>
       <xsl:if test="@cellpadding!=''">
           <xsl:attribute name="padding"><xsl:value-of 
select="@cellpadding"/></xsl:attribute>
       </xsl:if>
       <xsl:if test="@width!=''">
           <xsl:attribute 
name="inline-progression-dimension"><xsl:value-of 
select="@width"/></xsl:attribute>
           <xsl:attribute name="table-layout">fixed</xsl:attribute>
       </xsl:if>
       <xsl:variable name="nbCols">
           <xsl:for-each select="tr">
               <nbCol><xsl:value-of select="count(td)"/></nbCol>
           </xsl:for-each>
       </xsl:variable>
       <xsl:variable name="maxCol">
           <xsl:call-template name="math:max">
                <xsl:with-param name="nodes" select="$nbCols" />
           </xsl:call-template>
       </xsl:variable>
       <xsl:variable name="positions">
           <xsl:for-each select="tr[count(td)=$maxCol]">
               <posTd value="{position()}"/>
           </xsl:for-each>
       </xsl:variable>
       <xsl:apply-templates 
select="tr[position()=$positions/posTd[position()=1]]/@value" 
mode="table-columns"/-->
       <fo:table-body>
         <xsl:apply-templates/>
       </fo:table-body>
   </fo:table>
 </xsl:template>
 <xsl:template match="tr" mode="table-columns">
   <xsl:for-each select="td">
       <fo:table-column column-number="{position()}">
           <xsl:if test="@width!=''">
               <xsl:attribute name="column-width"><xsl:value-of 
select="@width"/></xsl:attribute>
           </xsl:if>
       </fo:table-column>
   </xsl:for-each>
 </xsl:template>

<!--template from exslt.org-->
<xsl:template name="math:max">
  <xsl:param name="nodes" select="/.." />
  <xsl:choose>
     <xsl:when test="not($nodes)">NaN</xsl:when>
     <xsl:otherwise>
        <xsl:for-each select="$nodes">
           <xsl:sort data-type="number" order="descending" />
           <xsl:if test="position() = 1">
              <xsl:value-of select="number(.)" />
           </xsl:if>
        </xsl:for-each>
     </xsl:otherwise>
  </xsl:choose>
</xsl:template>
The issue is that apparently the max template can't be applied to a tree 
fragment. Does anyone have an idea of a workaround ?

thanks for any help
Marc
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