format-number

Hello Friends,
I need to format a number with a dynamic format (is it possible first of all
?) .
I'm doing the following
<xsl:value-of select="format-number( sum(.), '{$fmt}' )" />
and I get {$fmt}as output.
I need to get the real sum formatted according to the variable $fmt .

Does anyone knows what am I doing wrong .

Please Help



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