メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349215860498 44.4839868282479, 142.348364993054 44.4837566591895, 142.34890355188 44.4825787713772, 142.34978033088 44.4827993498714, 142.349215860498 44.4839868282479)) ^^http://www.opengis.net/ont/geosparql#wktLiteral