メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.372033819639 43.0509987172676, 141.371681285294 43.0512081285069, 141.371602532833 43.0511422579741, 141.371521150812 43.0505614809643, 141.371501434123 43.0504646257157, 141.371581148386 43.0504226171583, 141.372597708497 43.0497728966368, 141.373189338833 43.0502816968145, 141.372033819639 43.0509987172676)) ^^http://www.opengis.net/ont/geosparql#wktLiteral