メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.782957988376 43.2044099849453, 141.782200889736 43.2050244562341, 141.780632345273 43.2041520919154, 141.781555562623 43.2034130519078, 141.782957988376 43.2044099849453)) ^^http://www.opengis.net/ont/geosparql#wktLiteral