メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.0062500 27.7291667, 129.0125000 27.7291667, 129.0125000 27.7333333, 129.0062500 27.7333333, 129.0062500 27.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral