メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.970918440157 43.5491092622422, 144.970468606751 43.5488455582139, 144.970042395699 43.5485997118183, 144.970862412719 43.5479340279542, 144.970885531637 43.5479493690768, 144.971693060152 43.5484832569901, 144.970918440157 43.5491092622422)) ^^http://www.opengis.net/ont/geosparql#wktLiteral