メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.32505478748 43.0539703904074, 141.325034617764 43.0540935143107, 141.324981028636 43.0542961214919, 141.324933709189 43.0544963883736, 141.323993839698 43.0543631752523, 141.323585066153 43.0543015618439, 141.323698129648 43.0537990610193, 141.323791792358 43.0533493615771, 141.324364228769 43.0534260827499, 141.325153359468 43.0535378892293, 141.325170873833 43.0535402813778, 141.32505478748 43.0539703904074)) ^^http://www.opengis.net/ont/geosparql#wktLiteral