メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.447313014665 32.1051824282613, 131.446544400204 32.1051686539426, 131.446542236879 32.1049863113837, 131.44653031779 32.1049864941278, 131.44652977801 32.1048745355533, 131.44733063654 32.1048886884868, 131.447321959928 32.1049946910708, 131.447313014665 32.1051824282613)) ^^http://www.opengis.net/ont/geosparql#wktLiteral