メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8687500 26.3541667, 127.8750000 26.3541667, 127.8750000 26.3583333, 127.8687500 26.3583333, 127.8687500 26.3541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral