Sorting an unsorted list of (xml) children and packing

I had managed to extract a list of element names from XML, but wanted to
distribute it across multiple columns of an HTML table. After a bit of the
familiar head-banging "why can't I print out <tr> tags on their own?" I
found out how to pack the names into rows of three, thanks to Jeni.

The problem is that I want the names to be in alphabetical order either like
so
A B C
D E F

or

A C E
B D F

Does anyone have any suggestions? My current solution is below but it seems
inefficient and slow. Also, can I do a logical AND without having to nest
<xsl:if>s?

A big newbie thank you,

Tom Weissmann

  <xsl:template match="Scoresheet">
    <xsl:apply-templates select="Corporation" mode="down"/>
  </xsl:template>

  <xsl:template match="Corporation" mode="down">
    <xsl:if test="position() mod 3=1">
      <tr>
        <xsl:apply-templates select="../Corporation" mode="across">
          <xsl:with-param name="row" select="position()"/>
          <xsl:sort select="@Name"/>
        </xsl:apply-templates>
      </tr>
    </xsl:if>  
  </xsl:template>

  <xsl:template match="Corporation" mode="across">
    <xsl:param name="row"/>
    <xsl:if test="position() >= $row">
      <xsl:if test="position() &lt;= $row + 2">
        <td>
           <xsl:value-of select="@Name"/>
         </td>
      </xsl:if>
    </xsl:if>
  </xsl:template>

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