メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7625000 34.7041667, 135.7687500 34.7041667, 135.7687500 34.7083333, 135.7625000 34.7083333, 135.7625000 34.7041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral