メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4312500 35.4708334, 135.4375000 35.4708334, 135.4375000 35.4750000, 135.4312500 35.4750000, 135.4312500 35.4708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral