メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.909806763256 43.5005376158434, 141.909798851991 43.5005145252075, 141.909379131702 43.4990999240452, 141.910292154741 43.4989708517905, 141.910344024864 43.4989635166215, 141.910722436513 43.5003361489277, 141.910110211003 43.5004475522128, 141.909806763256 43.5005376158434)) ^^http://www.opengis.net/ont/geosparql#wktLiteral