メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.2375000 28.2458334, 129.2437500 28.2458334, 129.2437500 28.2500000, 129.2375000 28.2500000, 129.2375000 28.2458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral