メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4875000 31.3958334, 130.4937500 31.3958334, 130.4937500 31.4000000, 130.4875000 31.4000000, 130.4875000 31.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral