メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.3500000 43.2250000, 144.3562500 43.2250000, 144.3562500 43.2291667, 144.3500000 43.2291667, 144.3500000 43.2250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral