メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.4875000 34.7041667, 137.4937500 34.7041667, 137.4937500 34.7083333, 137.4875000 34.7083333, 137.4875000 34.7041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral