メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.0937500 43.1458334, 145.1000000 43.1458334, 145.1000000 43.1500000, 145.0937500 43.1500000, 145.0937500 43.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral