メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903301786395 43.4660781026301, 141.902419053988 43.466216965536, 141.901947293711 43.4646310648761, 141.902180709787 43.4646007231952, 141.90250316155 43.4645588005682, 141.902844915033 43.4645143680784, 141.903301786395 43.4660781026301)) ^^http://www.opengis.net/ont/geosparql#wktLiteral