[xsl] 1 + 1 = 11

What am I missing?  I define a parameter, get the highest existing row 
number and I want to add a value to it -- so I can add the next table 
row with a new index.  I get the index value correctly, but when I add 
one (1) to it, I get  the string "11", rather than the number 2. Note 
that I specifically set the param to a number via the number() function. 
I've also tried using the number() function inside the select attribute 
of the apply-templates element, trying to coerce the result, but to no 
avail.
<xsl:template match="ntpServerTable">
  <xsl:param name="rowindex">
     <xsl:for-each select="ntpServerTableRow">
        <xsl:sort select="ntpServerTableRowIndex" data-type="number" 
order="descending" />
       <xsl:choose>
          <xsl:when test="position() = 1">
            <xsl:value-of select="number(ntpServerTableRowIndex)"/>
         </xsl:when>
         <xsl:otherwise>0</xsl:otherwise>
      </xsl:choose>
    </xsl:for-each>
  </xsl:param>
  <xsl:apply-templates select="ntpServerTableRow"/>
  <ntpServerTableRowIndex><xsl:value-of 
select="$rowindex+1"/></ntpServerTableRowIndex>

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