メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1625000 26.6916667, 128.1687500 26.6916667, 128.1687500 26.6958334, 128.1625000 26.6958334, 128.1625000 26.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral