メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.8437500 34.9916667, 134.8500000 34.9916667, 134.8500000 34.9958334, 134.8437500 34.9958334, 134.8437500 34.9916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral