メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.6687500 26.1083333, 127.6750000 26.1083333, 127.6750000 26.1125000, 127.6687500 26.1125000, 127.6687500 26.1083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral