メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.346533952886 43.0295945733287, 141.345811366457 43.0295461751724, 141.345028157863 43.0294871654831, 141.345078303047 43.0291342224332, 141.345137799577 43.0287188297254, 141.345226042302 43.0280693239766, 141.346731741188 43.0281808775822, 141.346626040414 43.0288714609573, 141.346551549045 43.0295451997041, 141.346533952886 43.0295945733287)) ^^http://www.opengis.net/ont/geosparql#wktLiteral