Elke Steegmans Kurt Schelfthout Tom Holvoet Yolande Berbers Paul Valckenaers Bart Saint Germain A Basic Taxonomy for Role Composition. 92-110 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2940&spage=92 2003 conf/selmas/2003 SELMAS db/conf/selmas/selmas2003.html#SteegmansSHBVG03