メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.360969139679 43.7657125345886, 142.359513114463 43.7661505726855, 142.359193137225 43.7655807153674, 142.358886408018 43.7650176135759, 142.360338953086 43.7645864437279, 142.360969139679 43.7657125345886)) ^^http://www.opengis.net/ont/geosparql#wktLiteral