メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7687500 31.7416667, 130.7750000 31.7416667, 130.7750000 31.7458334, 130.7687500 31.7458334, 130.7687500 31.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral