メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.9000000 26.3125000, 127.9062500 26.3125000, 127.9062500 26.3166667, 127.9000000 26.3166667, 127.9000000 26.3125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral