メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.2437500 43.2625000, 145.2500000 43.2625000, 145.2500000 43.2666667, 145.2437500 43.2666667, 145.2437500 43.2625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral