メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.374532693956 43.0471690393642, 141.374106532596 43.0474129897372, 141.373712073686 43.0470661975349, 141.374399164526 43.0466596724893, 141.374804759195 43.0469855182131, 141.374532693956 43.0471690393642)) ^^http://www.opengis.net/ont/geosparql#wktLiteral