メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404033556213 44.1754076866934, 142.403686420887 44.1759871366398, 142.402370383487 44.175159335042, 142.40256803727 44.1745240092189, 142.403022607122 44.1748040554816, 142.404033556213 44.1754076866934)) ^^http://www.opengis.net/ont/geosparql#wktLiteral