メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.971750356856 43.5496476659365, 144.970918440157 43.5491092622422, 144.971693060152 43.5484832569901, 144.972518890733 43.5490325234961, 144.971750356856 43.5496476659365)) ^^http://www.opengis.net/ont/geosparql#wktLiteral