メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.332198371565 43.0562819927018, 141.332057555371 43.0568233830806, 141.331128343624 43.0566922818034, 141.330504054917 43.056604204949, 141.330644716359 43.0560740682049, 141.330792683742 43.0554912426681, 141.33233439712 43.0556951305981, 141.332198371565 43.0562819927018)) ^^http://www.opengis.net/ont/geosparql#wktLiteral