メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7687500 43.8125000, 143.7750000 43.8125000, 143.7750000 43.8166667, 143.7687500 43.8166667, 143.7687500 43.8125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral