Tanel Tammet Hele-Mai Haav Vello Kadarpik Marko Kääramees Using a Rule Language for Capturing Semantics in Web-Based Systems. 249-259 2006 DB&IS conf/balt/2006 db/conf/balt/dbis2006.html#TammetHKK06 http://www.booksonline.iospress.nl/Content/View.aspx?piid=5442