メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.909614977564 43.5100534426925, 141.908940533914 43.510159628306, 141.908816513707 43.5093117574874, 141.908525164455 43.5082650675114, 141.909099148601 43.5081766940173, 141.909364851578 43.5091637401348, 141.909614977564 43.5100534426925)) ^^http://www.opengis.net/ont/geosparql#wktLiteral