メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6000000 33.2958334, 129.6062500 33.2958334, 129.6062500 33.3000000, 129.6000000 33.3000000, 129.6000000 33.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral