メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4437500 35.6083333, 134.4500000 35.6083333, 134.4500000 35.6125000, 134.4437500 35.6125000, 134.4437500 35.6083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral