メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.989369922032 43.5454819665784, 144.988737370971 43.5459699232258, 144.988585487716 43.5458694934203, 144.98785081568 43.5454183632973, 144.988481470371 43.5449013088484, 144.989187540137 43.5453698227541, 144.989369922032 43.5454819665784)) ^^http://www.opengis.net/ont/geosparql#wktLiteral