メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.7062500 42.9041667, 141.7125000 42.9041667, 141.7125000 42.9083333, 141.7062500 42.9083333, 141.7062500 42.9041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral