メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.768781068857 43.1951075832158, 141.769073894151 43.195262833046, 141.768424487362 43.1959667583035, 141.768094496344 43.1958067791345, 141.767465488864 43.195484769075, 141.768127314515 43.1947854726126, 141.768781068857 43.1951075832158)) ^^http://www.opengis.net/ont/geosparql#wktLiteral