メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7875000 33.2208334, 129.7937500 33.2208334, 129.7937500 33.2250000, 129.7875000 33.2250000, 129.7875000 33.2208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral