メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.344880139176 44.4862367193256, 142.343756892652 44.4859348055181, 142.343972388759 44.4854472229893, 142.345114655661 44.4857367426019, 142.344880139176 44.4862367193256)) ^^http://www.opengis.net/ont/geosparql#wktLiteral