メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1687500 43.8833333, 144.1750000 43.8833333, 144.1750000 43.8875000, 144.1687500 43.8875000, 144.1687500 43.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral