Crew who served on more than one expedition

Name	Exp1	Exp2
Douglas Mawson @en	Australasian Antarcti…	British Antarctic Exp…
Frank Hurley @en	Expedition Endurance…	Australasian Antarcti…
Frank Wild @en	Expedition Endurance…	British Antarctic Exp…
Robert Falcon Scott @en	Discovery Expedition…	Terra Nova Expedition…

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caviri.github.io/rete

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The query

PREFIX ex: <http://ex/> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?name ?exp1 ?exp2 WHERE { ?e1 ex:participant ?p ; rdfs:label ?exp1 . ?e2 ex:participant ?p ; rdfs:label ?exp2 . FILTER(STR(?e1) < STR(?e2)) ?p rdfs:label ?name . } ORDER BY ?name

rete playground · documentation · github.com/caviri/rete