メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.7312500 34.1916667, 135.7375000 34.1916667, 135.7375000 34.1958334, 135.7312500 34.1958334, 135.7312500 34.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral