メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8437500 26.3541667, 127.8500000 26.3541667, 127.8500000 26.3583333, 127.8437500 26.3583333, 127.8437500 26.3541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral