メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.374598081391 43.8304074715495, 142.372868914015 43.8291826349464, 142.375309025364 43.8274155360888, 142.376740953277 43.8284302786509, 142.377021118717 43.8286288226556, 142.376741793234 43.8288329575497, 142.374598081391 43.8304074715495)) ^^http://www.opengis.net/ont/geosparql#wktLiteral