メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.379788852184 43.7647162670411, 142.379917494728 43.764680329159, 142.380203165612 43.765181330713, 142.378540244282 43.7656568975623, 142.378259800719 43.7651603869871, 142.377963052343 43.7646154594766, 142.379492783607 43.764171607015, 142.379788852184 43.7647162670411)) ^^http://www.opengis.net/ont/geosparql#wktLiteral