メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.6812500 43.5958334, 143.6875000 43.5958334, 143.6875000 43.6000000, 143.6812500 43.6000000, 143.6812500 43.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral