Michael Lutz Catharina Riedemann Florian Probst A Classification Framework for Approaches to Achieving Semantic Interoperability between GI Web Services. 186-203 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2825&spage=186 2003 conf/cosit/2003 COSIT db/conf/cosit/cosit2003.html#LutzRP03