メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6437500 43.2666667, 144.6500000 43.2666667, 144.6500000 43.2708334, 144.6437500 43.2708334, 144.6437500 43.2666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral