メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.370792943782 43.8235526494777, 142.372013007021 43.8244263987553, 142.371046064459 43.8251135393948, 142.370822530449 43.8249734282924, 142.369702659944 43.8243442988699, 142.368397676986 43.8235568758959, 142.369594821848 43.8226876702707, 142.370792943782 43.8235526494777)) ^^http://www.opengis.net/ont/geosparql#wktLiteral