メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.525384278363 43.8491319366734, 141.525090447304 43.849616781428, 141.521184228538 43.8486575281975, 141.521394550167 43.8482061951766, 141.523293041578 43.8486622647273, 141.525384278363 43.8491319366734)) ^^http://www.opengis.net/ont/geosparql#wktLiteral