メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1312500 43.1208334, 144.1375000 43.1208334, 144.1375000 43.1250000, 144.1312500 43.1250000, 144.1312500 43.1208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral