メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6000000 29.4583333, 129.6062500 29.4583333, 129.6062500 29.4625000, 129.6000000 29.4625000, 129.6000000 29.4583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral