メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.6500000 26.1625000, 127.6562500 26.1625000, 127.6562500 26.1666667, 127.6500000 26.1666667, 127.6500000 26.1625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral