On 4 March 2011, Neil Kandalgaonkar wrote:
Google has introduced some nifty extensions to the Sitemap protocol, including geocoding and (especially dear to our hearts) licensing![2] However we don't have such information easily available in the database, so this requires parsing through every File page, which will take several millenia.
This will not work at all with the current sitemaps script as it scans the entire database every time and regenerates a number of sitemaps files from scratch. So, what we need is something more iterative, that only scans recent stuff. (Or, using such extensions will have to wait until someone brings licensing into the database).
...
-- Neil Kandalgaonkar neilk@wikimedia.org
Bryan, Roan and me are working on this: http://www.mediawiki.org/wiki/License_integration
Right now we're mostly brainstorming for the best way to do this, we expect to plan real development within 2011 but it will most certainly take a while before it's done and stable, working, backwards complatible, proper usability, code reviewed and live on Commons.
-- Krinkle