メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9187500 38.3708334, 140.9250000 38.3708334, 140.9250000 38.3750000, 140.9187500 38.3750000, 140.9187500 38.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral