[xsl] A variable in the test attribute of <xsl:if> ?

["John Horner" <Horner.John@xxxxxxxxxx>]

This may well be impossible, but I was wondering if (using MSXSL) I
could somehow use a variable in the test attribute of <xsl:if> ?

Instead of <xsl:if test="foo = 'bar'">, I would like to have "foo =
'bar'" in a variable and do this:

    <xsl:if test="$test">

Every time I search, I find mentions of the jscript dyn:evaluate
function:

 function evaluate(context, expression)
      {
         return context.nextNode().selectNodes(expression);
      }


 but that only seems to work in returning a value -- that is, I can do:

   <xsl:value-of select="dyn:evaluate(., <SOME EXPRESSION HERE> )"/>

but I can't do

    <xsl:if test="dyn:evaluate(., <SOME EXPRESSION HERE> )">

to return a boolean for whether the node matches.

Is there another function I could use?

=============================================================================
=
The information contained in this email and any attachment is confidential
and
may contain legally privileged or copyright material.   It is intended only
for
the use of the addressee(s).  If you are not the intended recipient of this
email, you are not permitted to disseminate, distribute or copy this email or
any attachments.  If you have received this message in error, please notify
the
sender immediately and delete this email from your system.  The ABC does not
represent or warrant that this transmission is secure or virus free.   Before
opening any attachment you should check for viruses.  The ABC's liability is
limited to resupplying any email and attachments
=============================================================================
=