メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4375000 28.3041667, 129.4437500 28.3041667, 129.4437500 28.3083333, 129.4375000 28.3083333, 129.4375000 28.3041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral