メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.3187500 33.2708334, 130.3250000 33.2708334, 130.3250000 33.2750000, 130.3187500 33.2750000, 130.3187500 33.2708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral