メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6750000 31.8958334, 130.6812500 31.8958334, 130.6812500 31.9000000, 130.6750000 31.9000000, 130.6750000 31.8958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral