メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4812500 34.5791667, 135.4875000 34.5791667, 135.4875000 34.5833333, 135.4812500 34.5833333, 135.4812500 34.5791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral