メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.120021150275 42.9742063484654, 144.118640871438 42.9735810966997, 144.117028153759 42.9728505391025, 144.117576671888 42.972278536253, 144.118694300614 42.9711133675155, 144.121570485912 42.9724718171076, 144.121208195368 42.9728862122228, 144.120021150275 42.9742063484654)) ^^http://www.opengis.net/ont/geosparql#wktLiteral