メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905860590842 43.4901161799755, 141.90508938206 43.4902875363385, 141.904901580233 43.4896293860084, 141.905695895391 43.489512216417, 141.905860590842 43.4901161799755)) ^^http://www.opengis.net/ont/geosparql#wktLiteral