メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.350819650511 43.0655823418527, 141.349250490892 43.0653776420401, 141.349548917659 43.0641578035429, 141.351122669349 43.0643743504006, 141.350971227689 43.0649705401085, 141.350819650511 43.0655823418527)) ^^http://www.opengis.net/ont/geosparql#wktLiteral