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 ?dateTimeValue (afn:localname(?dateTimeValue) AS ?dateTimeValueName) (afn:localname(?dateTimePrecision) AS ?precision) ?dateTime WHERE { GRAPH ?g1 { ?subject ?property ?dateTimeValue } OPTIONAL { GRAPH ?g2 { ?dateTimeValue core:dateTime ?dateTime } } OPTIONAL { GRAPH ?g3 { ?dateTimeValue core:dateTimePrecision ?dateTimePrecision } } }