メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9937500 32.2916667, 131.0000000 32.2916667, 131.0000000 32.2958334, 130.9937500 32.2958334, 130.9937500 32.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral