メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906163050653 43.4995849083065, 141.905473020776 43.4997035828061, 141.905157860876 43.498623512968, 141.905377392605 43.4985854601971, 141.905834683897 43.4985061360153, 141.905863428326 43.4985011238292, 141.906163050653 43.4995849083065)) ^^http://www.opengis.net/ont/geosparql#wktLiteral