[xsl] Xpath - count preceding-siblings matching some condition

I can't seem to get my xpath correct. (XSLT 2.0)  Besides my incorrect
xpath, is there a better way to do this?

I have data representing a table and need to increment the row number
when the column number of the following-sibling is less than the current
column number. There is no pattern to the data - a row might have any
column missing (i.e. empty).

The Xpath Visualizer gives me the correct number on the following
statement, but Saxon (via Oxygen) gives an error - A sequence of more
than one item is not allowed as the second operand of lt: 

count(preceding-sibling::a[(_at_)col-nbr lt preceding-sibling::a/@col-nbr])+2

<!-- The +2 is to accommodate the first row, which doesn't have a
preceding-sibling, and the new row number. ==>

Data:
<data>
  <a   col-nbr="1"   row-nbr="1"  />
  <a   col-nbr="2"   row-nbr="1"  />
  <a   col-nbr="1"   row-nbr="1"  />
  <a   col-nbr="2"   row-nbr="1"  />
  <a   col-nbr="3"   row-nbr="2"  />
  <a   col-nbr="2"   row-nbr="2"  />
  <a   col-nbr="3"   row-nbr="2"  />
  <a   col-nbr="1"   row-nbr="2"  />
  <a   col-nbr="2"   row-nbr="2"  />
  <a   col-nbr="3"   row-nbr="2"  />
</data>

Desired Output:
<table>
  <b  col-nbr="1"   row-nbr="1"  />
  <b  col-nbr="2"   row-nbr="1"  />
  <b  col-nbr="1"   row-nbr="2"  />
  <b  col-nbr="2"   row-nbr="2"  />
  <b  col-nbr="3"   row-nbr="2"  />
  <b  col-nbr="2"   row-nbr="3"  />
  <b  col-nbr="3"   row-nbr="3"  />
  <b  col-nbr="1"   row-nbr="4"  />
  <b  col-nbr="2"   row-nbr="4"  />
  <b  col-nbr="3"   row-nbr="4"  />
</table>

<xsl:template match="/">
 <xsl:variable name="tmp-table" select="//data/a"/>
  <table>
    <xsl:for-each select="$tmp-table">
      <xsl:variable name="col" select="@col-nbr"/>
      <xsl:variable name="row">
        <xsl:choose>
<!-- I intend this test to mean "If the next row in the list has a
column number less than this column number, count all the rows preceding
this one whose column number is less than the column number of the row
following it. -->
          <xsl:when test="following-sibling::a
                                [position()=1 and @col-nbr lt $col]">
            <xsl:value-of select="count(preceding-sibling::a
                     [(_at_)col-nbr gt following-sibling::a/@col-nbr])+2"/>
          </xsl:when>
          <xsl:otherwise>1</xsl:otherwise>
         </xsl:choose>
       </xsl:variable>
          
      <b col-nbr="{(_at_)col-nbr}" row-nbr="{$row}" />
    </xsl:for-each>
  </table>
</xsl:template>

Thanks!
Angela Williams 
Software Developer
The 401k Company, A Charles Schwab Company
98 San Jacinto Blvd. ~ Suite 1100 ~ Austin, TX 78701 
Office: 512.344.1547 ~ Fax: 512.397.6656
Angela(_dot_)Williams(_at_)The401kCompany(_dot_)com    
 



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