メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.1000000 44.1833333, 143.1062500 44.1833333, 143.1062500 44.1875000, 143.1000000 44.1875000, 143.1000000 44.1833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral