メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.1937500 31.3958334, 130.2000000 31.3958334, 130.2000000 31.4000000, 130.1937500 31.4000000, 130.1937500 31.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral