メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.8375000 35.3666667, 136.8437500 35.3666667, 136.8437500 35.3708334, 136.8375000 35.3708334, 136.8375000 35.3666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral