メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6125000 41.8250000, 140.6187500 41.8250000, 140.6187500 41.8291667, 140.6125000 41.8291667, 140.6125000 41.8250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral