メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3125000 39.5000000, 141.3187500 39.5000000, 141.3187500 39.5041667, 141.3125000 39.5041667, 141.3125000 39.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral