Manual:$wgEnableCreativeCommonsRdf

Details
Toggles the inclusion of [http://creativecommons.org/technology/metadata/ Creative Commons RDF metadata] in page output.

See RDF Metadata at Metawiki for more information.

In MediaWiki 1.8.2, the source file Skin.php contains function addMetadataLinks which calls addMetadataLink to add Creative Commons metadata when $wgEnableCreativeCommonsRdf evaluates true, with title Creative Commons and type application/rdf+xml, containing an embedded URL with query item.

When MediaWiki serves a page request with query item  present, function wfCreativeCommonsRdf is called within source file Metadata.php which parses <tvar|RightsUrl></> into metadata format.