メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.0187500 35.0791667, 136.0250000 35.0791667, 136.0250000 35.0833333, 136.0187500 35.0833333, 136.0187500 35.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral