メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.41627169176 43.8213795870149, 142.414588321196 43.8202265095648, 142.417100265987 43.8184077782143, 142.418740252796 43.819611829457, 142.41627169176 43.8213795870149)) ^^http://www.opengis.net/ont/geosparql#wktLiteral