SELECT * FROM http://swordfish.rdfweb.org/~libby/calendar/cal1.rdf, http://swordfish.rdfweb.org/~libby/calendar/cal2.rdf WHERE (ical::description ?event ?desc) (ical::dstart ?event ?date) (rdfs::label ?date ?q) (ical::hour ?date ?hourstart) (ical::minute ?date ?minstart) (ical::dtend ?event ?bla) USING ical FOR http://www.ietf.org/rfc/rfc2445.txt# foaf FOR http://xmlns.com/foaf/0.1/ rdfs FOR http://www.w3.org/2000/01/rdf-schema#