メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404570964702 44.1700241188878, 142.403349086616 44.1698323503542, 142.402957649128 44.1689681384473, 142.404209389288 44.1686830677161, 142.404698227547 44.1696129125047, 142.404570964702 44.1700241188878)) ^^http://www.opengis.net/ont/geosparql#wktLiteral