メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903506574742 43.4869316230974, 141.903146283285 43.4869581042961, 141.902806105463 43.4857880110632, 141.902529007089 43.4853533402837, 141.90315776667 43.4852840692771, 141.903403142709 43.4860718197492, 141.90360035262 43.4867769063993, 141.903545636425 43.4868697484872, 141.903506574742 43.4869316230974)) ^^http://www.opengis.net/ont/geosparql#wktLiteral