メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9000000 33.3000000, 129.9062500 33.3000000, 129.9062500 33.3041667, 129.9000000 33.3041667, 129.9000000 33.3000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral