メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.3562500 43.9541667, 144.3625000 43.9541667, 144.3625000 43.9583333, 144.3562500 43.9583333, 144.3562500 43.9541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral