メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4375000 28.2916667, 129.4437500 28.2916667, 129.4437500 28.2958334, 129.4375000 28.2958334, 129.4375000 28.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral