メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3000000 36.2333333, 136.3062500 36.2333333, 136.3062500 36.2375000, 136.3000000 36.2375000, 136.3000000 36.2333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral