メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.6375000 43.3208334, 145.6437500 43.3208334, 145.6437500 43.3250000, 145.6375000 43.3250000, 145.6375000 43.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral