メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.1437500 34.6958334, 135.1500000 34.6958334, 135.1500000 34.7000000, 135.1437500 34.7000000, 135.1437500 34.6958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral