メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8187500 33.1791667, 129.8250000 33.1791667, 129.8250000 33.1833333, 129.8187500 33.1833333, 129.8187500 33.1791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral