メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.3937500 32.3958334, 130.4000000 32.3958334, 130.4000000 32.4000000, 130.3937500 32.4000000, 130.3937500 32.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral