PDF/A validation problem

Hi all,
when I convert a text document in PDF/A-1a using OOo (3.x) and open it
with Reader I see the info message "File is compatible with PDF/A
standard".
But if I try to validate it using Adobe Acrobat, the result report
contain this message
"XMP property not predefined and no extension schema present"
Anyone has the same problem? Which is the XMP property that OOo
includes in the PDF?
Thanks.
Seva
-- 
-----------------------------------------------------------------
To unsubscribe send email to [email protected]
For additional commands send email to [email protected]
with Subject: help