メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.363104985246 43.7663264626859, 142.361529136529 43.7667700233932, 142.360969139679 43.7657125345886, 142.362497117388 43.7652827397661, 142.362792555292 43.7658095060383, 142.363104985246 43.7663264626859)) ^^http://www.opengis.net/ont/geosparql#wktLiteral