メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7500000 34.9583333, 135.7562500 34.9583333, 135.7562500 34.9625000, 135.7500000 34.9625000, 135.7500000 34.9583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral