メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2312500 34.1041667, 131.2375000 34.1041667, 131.2375000 34.1083333, 131.2312500 34.1083333, 131.2312500 34.1041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral