メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397974794436 44.1767674488401, 142.396771659298 44.1765782801288, 142.3970278286 44.1757661981855, 142.398215664708 44.175959042215, 142.397974794436 44.1767674488401)) ^^http://www.opengis.net/ont/geosparql#wktLiteral