メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4562500 43.6083333, 144.4625000 43.6083333, 144.4625000 43.6125000, 144.4562500 43.6125000, 144.4562500 43.6083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral