メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.364314897898 43.7653689681209, 142.364603851806 43.7659151809943, 142.363104985246 43.7663264626859, 142.362792555292 43.7658095060383, 142.362497117388 43.7652827397661, 142.364018000043 43.7648341030559, 142.364314897898 43.7653689681209)) ^^http://www.opengis.net/ont/geosparql#wktLiteral