メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4000000 28.2750000, 129.4062500 28.2750000, 129.4062500 28.2791667, 129.4000000 28.2791667, 129.4000000 28.2750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral