メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((126.7500000 26.3750000, 126.7562500 26.3750000, 126.7562500 26.3791667, 126.7500000 26.3791667, 126.7500000 26.3750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral