メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.6875000 26.1791667, 127.6937500 26.1791667, 127.6937500 26.1833333, 127.6875000 26.1833333, 127.6875000 26.1791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral