メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.354181251046 43.7746949916297, 142.353657754499 43.7748422551264, 142.353439693726 43.7744172611597, 142.35330710681 43.7741389648194, 142.354819211157 43.7736861718172, 142.354947942605 43.7739213977901, 142.354997107918 43.7744654238099, 142.354181251046 43.7746949916297)) ^^http://www.opengis.net/ont/geosparql#wktLiteral