メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.90906960538 43.4734875635129, 141.907469237767 43.4737445532441, 141.907414957669 43.4735680532931, 141.907178304864 43.4728803833009, 141.907134166425 43.4727508186345, 141.908743788226 43.4724272626323, 141.90906960538 43.4734875635129)) ^^http://www.opengis.net/ont/geosparql#wktLiteral