メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.769978907794 43.2062143935254, 141.76967578453 43.2065442268445, 141.768645476811 43.2060473935535, 141.768942935477 43.2057170458107, 141.7690495023 43.2055951220269, 141.770061909327 43.2061305592254, 141.769978907794 43.2062143935254)) ^^http://www.opengis.net/ont/geosparql#wktLiteral