メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.6750000 34.8250000, 135.6812500 34.8250000, 135.6812500 34.8291667, 135.6750000 34.8291667, 135.6750000 34.8250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral