メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6187500 33.2333333, 129.6250000 33.2333333, 129.6250000 33.2375000, 129.6187500 33.2375000, 129.6187500 33.2333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral