メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.1687500 43.9000000, 144.1750000 43.9000000, 144.1750000 43.9041667, 144.1687500 43.9041667, 144.1687500 43.9000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral