メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6437500 40.7791667, 140.6500000 40.7791667, 140.6500000 40.7833333, 140.6437500 40.7833333, 140.6437500 40.7791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral