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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

Hi,

You don't have to have two different if-then-elses for the start and end
tag, you can just do it in one go, like below. You also had an extra
"return", and need to have { } around the FLWOR expression within the
DtsResult element. You were also missing a } before the </Trace>

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
<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}
</DtsResult>

}</Trace>

That last FLWOR expression can also be just {$bb}, since it is the same
thing, as in:

<DtsResult>
{ $y/LogicalLink }
{ $y/ComPrimitive }
{ $bb }
</DtsResult>

Hope that helps,
Priscilla

----------------------------------
Priscilla Walmsley
Author, Definitive XML Schema
Coming soon: Definitive XQuery
http://www.datypic.com
----------------------------------

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