メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.3187500 44.3666667, 143.3250000 44.3666667, 143.3250000 44.3708334, 143.3187500 44.3708334, 143.3187500 44.3666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral