メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347709987441 44.4869210077986, 142.346511553181 44.4866428171004, 142.346731394564 44.4861464701235, 142.347142293788 44.4862506056425, 142.347940307072 44.4864528464845, 142.347963492932 44.4864587323818, 142.347709987441 44.4869210077986)) ^^http://www.opengis.net/ont/geosparql#wktLiteral