メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6437500 33.2916667, 129.6500000 33.2916667, 129.6500000 33.2958334, 129.6437500 33.2958334, 129.6437500 33.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral