In Oxygen 11.2 and previous versions, the Results window lists this commonly repeated warning:
 
The HTML tag "?xml version="1.0" encoding="UTF-8"?" is not a valid HTML tag (it does not begin with an alphanumeric character).
 
Each of the DITA templates provided in Oxygen includes this standard notation at the top of the xml file:

<?xml version='1.0' encoding='UTF-8'?>

Is there some action you recommend to eliminate this error, such as removing this tag at the top of the xml files?

Thank you.

Regards,

Gabrielle Burns
Information Products Developer
BRO Software Applications
Breault Research Organization, Inc.
gburns@breault.com