メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.344047246104 43.7761629700957, 142.343833018696 43.7757573247128, 142.345261015263 43.7753468513724, 142.345370126741 43.7753158173636, 142.345565388098 43.7757283500784, 142.344047246104 43.7761629700957)) ^^http://www.opengis.net/ont/geosparql#wktLiteral