メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405325843325 43.7345317609726, 142.405345393569 43.7348796296759, 142.405390336207 43.7352067195322, 142.404785852603 43.7352460118713, 142.403560122197 43.7353256812716, 142.403033948475 43.735359867704, 142.401325527771 43.7354708803672, 142.401240471246 43.7344054176107, 142.403433205549 43.7342907084535, 142.405293548073 43.7341716390576, 142.4052957692 43.7341964592319, 142.405325843325 43.7345317609726)) ^^http://www.opengis.net/ont/geosparql#wktLiteral