メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.6125000 27.3708334, 128.6187500 27.3708334, 128.6187500 27.3750000, 128.6125000 27.3750000, 128.6125000 27.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral