メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398215664708 44.175959042215, 142.3970278286 44.1757661981855, 142.397287629816 44.1748960306799, 142.398492871852 44.1750868284051, 142.398215664708 44.175959042215)) ^^http://www.opengis.net/ont/geosparql#wktLiteral