メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.378595184214 43.0764657536995, 141.37776669926 43.076353883034, 141.377939052952 43.075538392426, 141.378658168173 43.0759273005599, 141.378624246669 43.0762766492229, 141.378595184214 43.0764657536995)) ^^http://www.opengis.net/ont/geosparql#wktLiteral