メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7687500 26.1833333, 127.7750000 26.1833333, 127.7750000 26.1875000, 127.7687500 26.1875000, 127.7687500 26.1833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral