Bernd D. Heumesser Andreas Ludwig Dietmar Seipel Web Services Based on Prolog and Xml. 245-257 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3392&spage=245 2004 conf/wlp/2004 INAP/WLP db/conf/wlp/wlp2004.html#HeumesserLS04