メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.328788963446 43.7594205494448, 142.328979191171 43.7594745653678, 142.329515910074 43.7596341738752, 142.329234709048 43.760116753799, 142.328855216453 43.7607445967471, 142.328143543434 43.7605321884501, 142.327727550424 43.7604072467443, 142.327748994077 43.7603716148152, 142.328360935342 43.7592879365794, 142.328788963446 43.7594205494448)) ^^http://www.opengis.net/ont/geosparql#wktLiteral