メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5437500 33.5333333, 135.5500000 33.5333333, 135.5500000 33.5375000, 135.5437500 33.5375000, 135.5437500 33.5333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral