メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.37746660427 43.7717188757373, 142.377275184707 43.7717728649606, 142.376775642245 43.7719487079621, 142.376467998682 43.7713647217192, 142.377982936388 43.7709228757938, 142.378295990813 43.7715185259861, 142.378081059964 43.7715577221433, 142.377704974497 43.7716516314249, 142.37746660427 43.7717188757373)) ^^http://www.opengis.net/ont/geosparql#wktLiteral