メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.3437500 44.2958334, 145.3500000 44.2958334, 145.3500000 44.3000000, 145.3437500 44.3000000, 145.3437500 44.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral