メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.5500000 43.2250000, 143.5562500 43.2250000, 143.5562500 43.2291667, 143.5500000 43.2291667, 143.5500000 43.2250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral