Xquery how to arrange { .. } in right syntax

Question

In the xquery code bellow, i can't seem to get the syntax arranged starting with this line if (empty($bb)) then . The problem is either syntax error or i have xquery code shown in the output xml. I would appreciate help with the syntax of those last lines - how to place the curly brackets.
for $x in doc ($doc_name)/ProcessValueTrace/Trace
return
<Trace>
for $y in $x/DtsResult
let $bb:=for $xx in $y/DtsRequest where (contains($xx/PDU, string($pdu_byte_pattern))) return $xx
return
(: my problem is from here down. i have 3 outputs - first the beginning tag and a few tags i just output :)
     if (empty($bb)) then
     else
     return
          <DtsResult>
          { $y/LogicalLink }
          { $y/ComPrimitive }
(: than i output some selected tags:)
for $z in $y/DtsRequest
where (contains($z/PDU, string($pdu_byte_pattern)))
     return
$z
(: than i output the close tag - in case i had something before it:)
if (empty($bb)) then
else
          </DtsResult>     
</Trace>
I tried to place each of the 3 outputs in {..} but i kept getting error. I played a little with the {} but i didn't get them and the output right. I appreciate your help.
Best regards.
Paul

Answer 1

Why is it that you dont use one of the built in structures like a LinkedList to help you out? Also, if the data is coming from a DB why not do an order by on your query?
The fastest sort algorythim to use will be the Quick sort. If you look at the demos that come with java there is a sort demo that has this as one of the three examples and you could pull it right from Sun's code.
If you could even temporarily use something like a LinkedList then you could use the java.util.Arrays class to help you.