メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.708297020446 44.3624903976946, 141.707476242697 44.3630127296446, 141.706418684971 44.3622696606132, 141.706327589072 44.3621734569487, 141.706389715655 44.3621325138359, 141.707552114051 44.361375767918, 141.707631828391 44.3614360554893, 141.708297020446 44.3624903976946)) ^^http://www.opengis.net/ont/geosparql#wktLiteral