メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6187500 33.0416667, 129.6250000 33.0416667, 129.6250000 33.0458334, 129.6187500 33.0458334, 129.6187500 33.0416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral