メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8187500 31.8833333, 130.8250000 31.8833333, 130.8250000 31.8875000, 130.8187500 31.8875000, 130.8187500 31.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral