メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.204853971042 42.9482170393346, 143.203843862199 42.9482861384035, 143.203768984614 42.9462832652656, 143.204557198356 42.9462359172671, 143.204682098835 42.9470389627624, 143.204853971042 42.9482170393346)) ^^http://www.opengis.net/ont/geosparql#wktLiteral