PREFIX ical: PREFIX xsd: SELECT ?summary1 ?location1 FROM FROM FROM WHERE { ?event1 a ical:Vevent; ical:dtstart ?start1; ical:dtend ?stop1; ical:url ?uri1; ical:location ?location1; ical:summary ?summary1. ?event2 a ical:Vevent; ical:dtstart ?start2; ical:dtend ?stop2; ical:url ?uri2; ical:location ?location2; ical:summary ?summary2. FILTER ( ?start1 = ?start2 && ?stop1 = ?stop2 && ?uri1 != ?uri2 && ?location1=?location2) }