rel="EditURI"

<link rel="EditURI" type="application/rsd+xml" title="RSD"
href="http://www.toseco.at/xmlrpc.php?rsd" />
Brings the Validator Message:
Bad value EditURI for attribute rel on element link: Keyword edituri is not
registered.
Syntax of link type valid for <link>:
A whitespace-separated list of link types listed as allowed on <link> in the
<http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#link
Types> HTML specification or listed as an allowed on <link> on the
<http://microformats.org/wiki/existing-rel-values#HTML5_link_type_extensions
> Microformats wiki without duplicate keywords in the list. You can register
link types on the
<http://microformats.org/wiki/existing-rel-values#HTML5_link_type_extensions
> Microformats wiki yourself. 
But it is found in Microformat wiki
See:
http://microformats.org/wiki/existing-rel-values#HTML5_link_type_extensions
 
I checked www.toseco.at (my site)
 
Best regards..
 
robert