メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.7000000 43.9000000, 144.7062500 43.9000000, 144.7062500 43.9041667, 144.7000000 43.9041667, 144.7000000 43.9000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral