メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((132.9187500 32.7875000, 132.9250000 32.7875000, 132.9250000 32.7916667, 132.9187500 32.7916667, 132.9187500 32.7875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral