メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.914686625428 43.4996864744025, 141.913070833318 43.4999454769869, 141.912984039864 43.4996501313452, 141.912908939051 43.4993501077238, 141.912866721541 43.4991990977672, 141.914639476642 43.4989103884106, 141.914763685026 43.4988933824045, 141.914983953311 43.4996307349891, 141.915021576412 43.4997316231823, 141.914797847809 43.4997683797751, 141.914753027283 43.4996763317471, 141.914686625428 43.4996864744025)) ^^http://www.opengis.net/ont/geosparql#wktLiteral