メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395289602307 44.1814335392788, 142.393781047006 44.1811846729733, 142.394035810295 44.1803839260868, 142.394328961245 44.1794625184333, 142.395818819334 44.1797042841851, 142.395289602307 44.1814335392788)) ^^http://www.opengis.net/ont/geosparql#wktLiteral