メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.982817548805 43.5637252886532, 144.982044644534 43.5643523073856, 144.980752931119 43.5634811484775, 144.981499437167 43.5628732976109, 144.982014643875 43.5632105999719, 144.982817548805 43.5637252886532)) ^^http://www.opengis.net/ont/geosparql#wktLiteral