メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3250000 28.0916667, 129.3312500 28.0916667, 129.3312500 28.0958334, 129.3250000 28.0958334, 129.3250000 28.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral