メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.2937500 34.2083333, 129.3000000 34.2083333, 129.3000000 34.2125000, 129.2937500 34.2125000, 129.2937500 34.2083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral