メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.37981033191 42.9985797796749, 144.380649565588 42.9987220975447, 144.380279740699 42.9998967265269, 144.379441813605 42.9997428467651, 144.378738433172 42.9996283725796, 144.379123322004 42.9984617679121, 144.37981033191 42.9985797796749)) ^^http://www.opengis.net/ont/geosparql#wktLiteral