メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.363787606481 43.7751634254157, 142.364153426849 43.7752798167079, 142.364514168969 43.7753928185382, 142.364137844364 43.7760105204843, 142.363779614413 43.7758940682503, 142.363408068037 43.7757846956629, 142.362688478062 43.7755523354613, 142.363051687491 43.7749401543801, 142.363787606481 43.7751634254157)) ^^http://www.opengis.net/ont/geosparql#wktLiteral