メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6625000 33.7833333, 129.6687500 33.7833333, 129.6687500 33.7875000, 129.6625000 33.7875000, 129.6625000 33.7833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral