メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5187500 31.5208334, 130.5250000 31.5208334, 130.5250000 31.5250000, 130.5187500 31.5250000, 130.5187500 31.5208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral