try

declare variable $a external := ();




----------------------------------------
David A. Lee
[email protected]<mailto:[email protected]>
http://www.xmlsh.org

From: [email protected] [mailto:[email protected]] On Behalf Of 
Kunal Chauhan
Sent: Wednesday, June 19, 2013 2:10 AM
To: [email protected]
Subject: [xquery-talk] value not bound exception while using empty()

Hello,
Whenever I declare an external variable and I don't supply any value to it. and 
try to run empty() it gives me an error stating that value unbound.
Stated error is right. but as per the requirement. If I have a variable and 
that variable doesn't have any value than it should give me result of  empty() 
true.
For eg.

declare variable $a external;

return empty($a)
I am execute this query for that purpose only, whether $a is empty or not.
If I initialize it with space or something than empty() gives me result false.
might be I am missing something.

Regards,

--
Kunal Chauhan
[email protected]<mailto:[email protected]>
[+918655517141]
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