メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.7312500 32.7041667, 128.7375000 32.7041667, 128.7375000 32.7083333, 128.7312500 32.7083333, 128.7312500 32.7041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral