メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((123.8750000 24.2666667, 123.8812500 24.2666667, 123.8812500 24.2708334, 123.8750000 24.2708334, 123.8750000 24.2666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral