メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.6062500 43.3041667, 141.6125000 43.3041667, 141.6125000 43.3083333, 141.6062500 43.3083333, 141.6062500 43.3041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral