メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3312500 41.3041667, 141.3375000 41.3041667, 141.3375000 41.3083333, 141.3312500 41.3083333, 141.3312500 41.3041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral