メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.6187500 43.7708334, 143.6250000 43.7708334, 143.6250000 43.7750000, 143.6187500 43.7750000, 143.6187500 43.7708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral