メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((125.4625000 24.7166667, 125.4687500 24.7166667, 125.4687500 24.7208334, 125.4625000 24.7208334, 125.4625000 24.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral