XQuery/XPath problem (question)

[sjurisic]

Hi All,

This is XQuery/XPath question and I spent a lots of time searching the web - and could not figure it out;

My query:

let $m := //bookkeeping[@date[contains(.,'200503')]]//record/@billed

return

$m

returns proper results; However, results includes both numbers and empty tags (whitespace)

If I do:

let $m := //bookkeeping[@date[contains(.,'200503')]]//record/@billed

return

sum($m)

I have an exception:
"An exception occurred during query execution: cannot convert string ''into a double"

How to work around it?

MANY THANKS,
Sava