メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.645427606669 43.9363794503752, 141.644378997223 43.9371163272831, 141.643794885667 43.9367140714106, 141.642993841864 43.9361481151361, 141.643026154789 43.9361236098262, 141.64405438496 43.9353861842798, 141.645427606669 43.9363794503752)) ^^http://www.opengis.net/ont/geosparql#wktLiteral