メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.18294013123 39.1823660313943, 141.180726671612 39.1821690728219, 141.18063426039 39.1821608327818, 141.180866040783 39.1805724997, 141.181118980869 39.1791140173258, 141.18348714709 39.1793195121129, 141.18294013123 39.1823660313943)) ^^http://www.opengis.net/ont/geosparql#wktLiteral