[XQZone General] trick for dynamically setting a sort to ascending/descending

[Travis Raybold]

in case this helps anyone... i found a cute little trick for sorting 
ascending and descending conditionally...

just sort by two values, the first one being the actual value if the 
order type is ascending and 1 otherwise (to ensure it doesn't do any 
actual sorting) and the second being a descending sort of the value if 
the sort type is descending, and 1 otherwise.

let $orderBy := "name"
let $orderDirection := "descending"
for $i in $nodes
  if ($orderDirection = "ascending") then $i/*[name()=$orderBy]  else 1,
  if ($orderDirection = "descending") then $i/*[name()=$orderBy] else 1 
descending
  return $i

--travis
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