メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7062500 33.7916667, 129.7125000 33.7916667, 129.7125000 33.7958334, 129.7062500 33.7958334, 129.7062500 33.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral