メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.5500000 43.6708334, 143.5562500 43.6708334, 143.5562500 43.6750000, 143.5500000 43.6750000, 143.5500000 43.6708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral