メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378521722658 43.7561693223665, 142.378836720981 43.7567170911801, 142.377350816545 43.7571505535158, 142.377047712052 43.7565964912212, 142.376731054571 43.75598405892, 142.37751770331 43.7557565260734, 142.378196343199 43.7555730597678, 142.378521722658 43.7561693223665)) ^^http://www.opengis.net/ont/geosparql#wktLiteral