メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908281467305 43.5120517913086, 141.908099699428 43.5120846873223, 141.907602170691 43.5103637554161, 141.908940533914 43.510159628306, 141.909414082376 43.5118469715214, 141.908281467305 43.5120517913086)) ^^http://www.opengis.net/ont/geosparql#wktLiteral