メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.0312500 26.5666667, 128.0375000 26.5666667, 128.0375000 26.5708334, 128.0312500 26.5708334, 128.0312500 26.5666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral