メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.349111940351 43.0659698506707, 141.348979151457 43.0665548612767, 141.347408711186 43.0663315589119, 141.347546652325 43.0657690261872, 141.347694012411 43.0651658470382, 141.349250490892 43.0653776420401, 141.349111940351 43.0659698506707)) ^^http://www.opengis.net/ont/geosparql#wktLiteral