メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.9250000 43.5500000, 144.9312500 43.5500000, 144.9312500 43.5541667, 144.9250000 43.5541667, 144.9250000 43.5500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral