メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.340479202159 43.0617154911411, 141.340388781093 43.0620638877557, 141.340195036792 43.0628934995367, 141.338635147148 43.0626787371073, 141.338769598085 43.0620782812464, 141.338908425778 43.0614995219197, 141.340479202159 43.0617154911411)) ^^http://www.opengis.net/ont/geosparql#wktLiteral