メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9937500 33.9458334, 136.0000000 33.9458334, 136.0000000 33.9500000, 135.9937500 33.9500000, 135.9937500 33.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral