メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2375000 40.6750000, 141.2437500 40.6750000, 141.2437500 40.6791667, 141.2375000 40.6791667, 141.2375000 40.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral