メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.928584403311 43.5774744833638, 141.928436659506 43.5775125363137, 141.927510539528 43.5777408400419, 141.926533856414 43.5779808794324, 141.926039272751 43.5770040597627, 141.928084795292 43.5764685822158, 141.928091308367 43.576466876749, 141.928087040726 43.5764782221385, 141.928584403311 43.5774744833638)) ^^http://www.opengis.net/ont/geosparql#wktLiteral