メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.9625000 43.4166667, 143.9687500 43.4166667, 143.9687500 43.4208334, 143.9625000 43.4208334, 143.9625000 43.4166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral