メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9437500 32.9833333, 129.9500000 32.9833333, 129.9500000 32.9875000, 129.9437500 32.9875000, 129.9437500 32.9833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral