メタデータ名 PeriodOfTime
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2187500 36.0666667, 139.2250000 36.0666667, 139.2250000 36.0708334, 139.2187500 36.0708334, 139.2187500 36.0666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral