メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.460747952683 43.0543998836325, 144.458975382983 43.0534978852154, 144.462272291959 43.0518662026457, 144.462807002561 43.0522340719621, 144.463633174296 43.0528291479781, 144.462143436122 43.0532263542285, 144.461989160784 43.0533042370556, 144.460747952683 43.0543998836325)) ^^http://www.opengis.net/ont/geosparql#wktLiteral