メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.914640775631 43.5226264282224, 141.913776645082 43.5227505905025, 141.913478345458 43.5216331537873, 141.913570354633 43.521618795923, 141.914325401139 43.5215011729695, 141.914640775631 43.5226264282224)) ^^http://www.opengis.net/ont/geosparql#wktLiteral