メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.9000000 35.0916667, 136.9062500 35.0916667, 136.9062500 35.0958334, 136.9000000 35.0958334, 136.9000000 35.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral