メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.0875000 33.2666667, 129.0937500 33.2666667, 129.0937500 33.2708334, 129.0875000 33.2708334, 129.0875000 33.2666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral