メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7312500 31.9958334, 130.7375000 31.9958334, 130.7375000 32.0000000, 130.7312500 32.0000000, 130.7312500 31.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral