メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347477873376 43.7756692662831, 142.347722665893 43.7760669832113, 142.346022509401 43.7765542016831, 142.345790566995 43.7761560643013, 142.345808124317 43.7761511617069, 142.345565388098 43.7757283500784, 142.347243626857 43.7752415125738, 142.347250594032 43.7752542872174, 142.347477873376 43.7756692662831)) ^^http://www.opengis.net/ont/geosparql#wktLiteral