メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.520824803166 43.8493677619624, 141.520774185161 43.8494469365997, 141.520746360514 43.8495055829281, 141.520557601379 43.8498731059538, 141.517996272415 43.8492679790994, 141.517960879246 43.8493056543095, 141.517871432078 43.8492781315154, 141.517723220798 43.8492325461149, 141.517907976606 43.8488996339101, 141.517990940822 43.8487500296071, 141.518159662274 43.848751109599, 141.518183495396 43.8487091586544, 141.520824803166 43.8493677619624)) ^^http://www.opengis.net/ont/geosparql#wktLiteral