メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8812500 26.3458334, 127.8875000 26.3458334, 127.8875000 26.3500000, 127.8812500 26.3500000, 127.8812500 26.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral