メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.573376121877 43.3290942114334, 145.572866575301 43.3294792566596, 145.572324750241 43.3298942099018, 145.571784702492 43.3295018452936, 145.571221449041 43.3291218966445, 145.571757021473 43.3286982698985, 145.57231448426 43.3282946091306, 145.573376121877 43.3290942114334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral