They've installed several 'Semantic' extensions:

    http://rosettacode.org/wiki/Special:Version#Installed_extensions


    http://rosettacode.org/wiki/Rosetta_Code:Village_Pump/Semantic_MediaWiki

            http://semantic-mediawiki.org/wiki/Help:Editing
            http://semantic-mediawiki.org/wiki/Help:Properties_and_types
            http://semantic-mediawiki.org/wiki/Help:Semantic_templates
            http://semantic-mediawiki.org/wiki/Help:Inline_queries
            http://semantic-mediawiki.org/wiki/Help:RDF_export