メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3125000 34.5041667, 136.3187500 34.5041667, 136.3187500 34.5083333, 136.3125000 34.5083333, 136.3125000 34.5041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral