メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378033495334 43.7517450251111, 142.377194352352 43.7519998865435, 142.376375778222 43.7522360319571, 142.375841136221 43.7511921676397, 142.376570614213 43.7509582880021, 142.377386082689 43.7506713187656, 142.378033495334 43.7517450251111)) ^^http://www.opengis.net/ont/geosparql#wktLiteral