メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.3375000 35.3541667, 134.3437500 35.3541667, 134.3437500 35.3583333, 134.3375000 35.3583333, 134.3375000 35.3541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral