メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.65194926835 43.9256396768659, 141.651602099097 43.9249158275979, 141.651174192149 43.9241673190456, 141.651244232815 43.9241534832109, 141.651461230923 43.9241106398667, 141.651929498478 43.9240366025674, 141.654789735792 43.9235813847402, 141.65508179321 43.9248101967958, 141.652072918426 43.9256017821859, 141.65194926835 43.9256396768659)) ^^http://www.opengis.net/ont/geosparql#wktLiteral