Bad value DC.publisher for attribute name on element meta: Keyword dc.publisher is not registered

From: <comercial@owns.biz>
Date: Thu, 17 May 2012 17:03:32 -0400
To: www-validator@w3.org
Message-ID: <1bd0313ca03fe80a109a5751a8598fb6.squirrel@emailmg.ipower.com>

How can I validate Dublin Core? Dublin Core is a (Registered Trademark) 
but validator is not accepting in my site SEO Portugal http://www.owns.biz

Bad value DC.publisher for attribute name on element meta: Keyword
dc.publisher is not registered.

Best regards
Mario

Received on Saturday, 19 May 2012 05:41:02 UTC