メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.7500000 26.3791667, 127.7562500 26.3791667, 127.7562500 26.3833333, 127.7500000 26.3833333, 127.7500000 26.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral