José Luis Ambite Dipsy Kapoor Automatically Composing Data Workflows with Relational Descriptions and Shim Services. 15-29 2007 conf/semweb/2007 ISWC/ASWC http://dx.doi.org/10.1007/978-3-540-76298-0_2 db/conf/semweb/iswc2007.html#AmbiteK07