メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8000000 26.3000000, 127.8062500 26.3000000, 127.8062500 26.3041667, 127.8000000 26.3041667, 127.8000000 26.3000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral