メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5625000 31.7166667, 130.5687500 31.7166667, 130.5687500 31.7208334, 130.5625000 31.7208334, 130.5625000 31.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral