メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8187500 32.6708334, 128.8250000 32.6708334, 128.8250000 32.6750000, 128.8187500 32.6750000, 128.8187500 32.6708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral