メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2750000 34.9666667, 135.2812500 34.9666667, 135.2812500 34.9708334, 135.2750000 34.9708334, 135.2750000 34.9666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral