メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912857456336 43.5043738915898, 141.910973194834 43.5046624505793, 141.910698655334 43.5037077668624, 141.91055732761 43.5032890112401, 141.910499147084 43.5030652366157, 141.912369126579 43.5027789997664, 141.91239281091 43.5028581168226, 141.912653244761 43.5036828971929, 141.912857456336 43.5043738915898)) ^^http://www.opengis.net/ont/geosparql#wktLiteral