メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5937500 32.3166667, 131.6000000 32.3166667, 131.6000000 32.3208334, 131.5937500 32.3208334, 131.5937500 32.3166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral