[xsl] unable to dynamically set sort order

["bharat chintapally" <hydbad@xxxxxxxxxxx>]

Hello All:
         I am trying to dynamically set sort order and sort column in my 
XSLT. It seems that I can not use an expression for "order".

<xsl:apply-templates select="Uow">
  <xsl:sort select="$sortColumn" order="$sortOrder"/>
  <xsl:with-param name="from" select="$startRow"/>
  <xsl:with-param name="to" select="$endRow"/>
</xsl:apply-templates>

** $sortColumn and $sortOrder are variables here

Is there any other way I can solve this issue? The reason I need to do this 
is to keep track of users preference between requests when they are 
sorting..

Any ideas or help is really appreciated..

Thanks
--bharat

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