メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.9875000 35.2666667, 135.9937500 35.2666667, 135.9937500 35.2708334, 135.9875000 35.2708334, 135.9875000 35.2666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral