メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.2625000 31.2958334, 130.2687500 31.2958334, 130.2687500 31.3000000, 130.2625000 31.3000000, 130.2625000 31.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral