メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8000000 26.1541667, 127.8062500 26.1541667, 127.8062500 26.1583333, 127.8000000 26.1583333, 127.8000000 26.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral