メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3187500 29.2208334, 129.3250000 29.2208334, 129.3250000 29.2250000, 129.3187500 29.2250000, 129.3187500 29.2208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral