メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7312500 32.8083333, 129.7375000 32.8083333, 129.7375000 32.8125000, 129.7312500 32.8125000, 129.7312500 32.8083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral