メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752639639192 43.1964984664908, 141.751911508626 43.1972282623893, 141.751120246494 43.196837311671, 141.751827642007 43.1960869627862, 141.752169355336 43.1962601210451, 141.752609437488 43.1964831444746, 141.752639639192 43.1964984664908)) ^^http://www.opengis.net/ont/geosparql#wktLiteral