メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4500000 43.9291667, 144.4562500 43.9291667, 144.4562500 43.9333333, 144.4500000 43.9333333, 144.4500000 43.9291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral