メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1562500 34.8291667, 136.1625000 34.8291667, 136.1625000 34.8333333, 136.1562500 34.8333333, 136.1562500 34.8291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral