Q on xsl:choose

I seem to be stuck!

I have a small sample data set and am trying to use xsl:choose and xsl:when.

(My code and data is below)

I get this error message...

   Attribute 'match' is invalid on 'xsl:when'

I have spent the last 2 days trying to see the error here.

Can anyone elighten me?

Thanks

Walter

PS: This is an extention to an example in Mr Kay's book.


This is my data...

<books>
 <titles>
  <display colWidth='040' id='item' order='D'>Item</display>
 </titles>
</books>

This is my code

<xsl:template match='display'>
  <th valign='top'>
   <!-- define Default Sort Direction -->
   <xsl:attribute name='ind'>
    <xsl:choose>
     <xsl:when match="@order='D'">DN</xsl:when>
     <xsl:otherwise>UP</xsl:otherwise>
    </xsl:choose>
   </xsl:attribute>
   <!-- Display Title -->
   <xsl:value-of select='.'/>
  </th>
</xsl:template>




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