(2013-04-18) Bernard Vatant: New version has marked some classes as "archaic". No date is declared either in documentation or RDF file.
(2012-03-21) Bernard Vatant: This vocabulary was produced during Culture Hack London 2011 http://culturehackday.org.uk/previous-hacks/culture-hack-london-2011/, based on previous work available at http://lukeblaney.co.uk/projects/bedlam.
(2015-04-07) Bernard Vatant: Annual review OK. Version history checked.
