メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397287629816 44.1748960306799, 142.395825105492 44.174658101063, 142.396182558548 44.1735072676324, 142.396191314479 44.1735121617667, 142.397637928718 44.1737425122919, 142.397287629816 44.1748960306799)) ^^http://www.opengis.net/ont/geosparql#wktLiteral