メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.1250000 43.1541667, 145.1312500 43.1541667, 145.1312500 43.1583333, 145.1250000 43.1583333, 145.1250000 43.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral