メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3187500 34.3583333, 131.3250000 34.3583333, 131.3250000 34.3625000, 131.3187500 34.3625000, 131.3187500 34.3583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral