メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906412678019 43.4824614426673, 141.905398763849 43.4826124541345, 141.905004961529 43.4814047482959, 141.906063838945 43.4812576709681, 141.906182310581 43.4816553949032, 141.906412678019 43.4824614426673)) ^^http://www.opengis.net/ont/geosparql#wktLiteral