メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.90640205959 43.5003892791851, 141.905667131497 43.5003542631633, 141.905473020776 43.4997035828061, 141.906163050653 43.4995849083065, 141.90640205959 43.5003892791851)) ^^http://www.opengis.net/ont/geosparql#wktLiteral