メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.885762864888 43.0125502841039, 142.884943361315 43.0132524213195, 142.883766630349 43.0125236360337, 142.884103681222 43.0122294836804, 142.884565153167 43.0118266870473, 142.885118184514 43.011344048881, 142.886294038946 43.0120952603376, 142.885885935318 43.0124448814196, 142.885762864888 43.0125502841039)) ^^http://www.opengis.net/ont/geosparql#wktLiteral