メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1437500 39.8791667, 141.1500000 39.8791667, 141.1500000 39.8833333, 141.1437500 39.8833333, 141.1437500 39.8791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral