メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403280403183 43.7546495664198, 142.403311552313 43.7551029432187, 142.401376963106 43.7552289262955, 142.400529432134 43.7552790651043, 142.399276175903 43.7553427680345, 142.399229908817 43.7548689470973, 142.399197120911 43.7543932994537, 142.401276912924 43.7542760043057, 142.403230983768 43.7541788640402, 142.403280403183 43.7546495664198)) ^^http://www.opengis.net/ont/geosparql#wktLiteral