I released the 19th version of the GRDDDL profile and transformation for RDFa. The latest version of this profile and this transformation are always available at this URL:
http://ns.inria.fr/grddl/rdfa/
The use of this profile licenses RDF data extracted by the RDFa2RDFXML.xsl XSLT transformation from an RDFa source.
If you want to declare that a document contains RDFa and always uses the latest profile, add this profile to the head of your XHTML:
<head profile="http://ns.inria.fr/grddl/rdfa/">
If you want to use a specific version of the transformation, use the specific profile of that version, e.g.:
<head profile="http://ns.inria.fr/grddl/rdfa/2008/08/07/">
or reference the transformation directly, e.g.:
<head profile="http://www.w3.org/2003/g/data-view">
(...)
<link rel="transformation" href="http://ns.inria.fr/grddl/rdfa/2008/08/07/RDFa2RDFXML.xsl"/>
(...)
</head>
This software is distributed under either the GNU Lesser General Public License version 3 or the CeCILL-C license.
This transformation is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation version 3 of the License or under the terms of the CeCILL-C license.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License version 3 and the CeCILL-C license for more details.