PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX core: <http://vivoweb.org/ontology/core#> PREFIX afn: <http://jena.hpl.hp.com/ARQ/function#> SELECT DISTINCT ?dateTimeStart (afn:localname(?dateTimePrecisionStart) AS ?precisionStart) ?dateTimeEnd (afn:localname(?dateTimePrecisionEnd) AS ?precisionEnd) WHERE { GRAPH ?g1 { ?subject ?property ?dateTimeInterval } OPTIONAL { GRAPH ?g2 { ?dateTimeInterval core:start ?dateTimeStartValue . ?dateTimeStartValue core:dateTime ?dateTimeStart ; core:dateTimePrecision ?dateTimePrecisionStart . } } OPTIONAL { GRAPH ?g3 { ?dateTimeInterval core:end ?dateTimeEndValue . ?dateTimeEndValue core:dateTime ?dateTimeEnd ; core:dateTimePrecision ?dateTimePrecisionEnd . } } }