FW: Descending Order in Repeat

Hello All,

I am trying to display values in descending order in xforms:repeat using exforms:sort

<xforms:repeat id="event-repeat"  nodeset="exforms:sort(instance('events-instance')/Event[CreatedAt&lt;=now() and(ExpirationDate='' or ExpirationDate &gt; current-date())],'CreatedAt','text','descending','lower-first')[position() gt xs:integer(instance('positions')/positionst) and position() le xs:integer(instance('positions')/positionen)]" >

But the values are  not displaying in descending order

Thanks,

Srikanth A