メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8562500 33.1583333, 129.8625000 33.1583333, 129.8625000 33.1625000, 129.8562500 33.1625000, 129.8562500 33.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral