メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9500000 28.2958334, 129.9562500 28.2958334, 129.9562500 28.3000000, 129.9500000 28.3000000, 129.9500000 28.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral