メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.357780853125 43.0783908443189, 141.35622504538 43.0781743858279, 141.356212119164 43.0781725968715, 141.356357546751 43.0776066033247, 141.356474857488 43.0771529825734, 141.356505959102 43.0770329620034, 141.358069945338 43.0772461077888, 141.357780853125 43.0783908443189)) ^^http://www.opengis.net/ont/geosparql#wktLiteral