メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.4375000 44.2333333, 143.4437500 44.2333333, 143.4437500 44.2375000, 143.4375000 44.2375000, 143.4375000 44.2333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral