メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4812500 32.2916667, 130.4875000 32.2916667, 130.4875000 32.2958334, 130.4812500 32.2958334, 130.4812500 32.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral