Can't set Optional Element to Nil in Xquery Transformation

Question

I am new to Workshop and I am performing a transformation between two XML files that I will call source and target for example. I have multiple time/date elements that are optional in the target XML schema. I want to know how to set their values to null (nil?) if there is no data in the corresponding source XML schema element. Any ideas?
I get syntax errors with xquery set up like this:
if (data($iter_requestXML1/mySourceDate) != "" ) then
xs:date($iter_requestXML1/mySourceDate)
else
(nil)
I want to do something like above, but I don't know the right syntax.
However if I leave the "else" clause as:
else ()
Then I don't have a syntax error, but I get an exception whenever I try to reference the target XML element whenever their was no data for this element.
In the last example, I am thinking I get the reference error because the element was never initialized to NULL or NIL. But I don't know how to set it. Please Help!

Answer 1

1st :  It runs perfectly fine at 1280x1024@75Hz in Windows XP/Vista, so there is no reason it shouldn't work in Linux. In Nvidia-panel there is even the 75Hz option in the drop-down list when resolution is 1280x1024.
2nd : It isn't easy on the eyes at 60Hz compared to 75Hz, even more when i play games (Quake 3 for example).
Last edited by Kaloos (2009-04-27 21:22:18)