メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.36984123885 43.0062947862177, 144.370125954067 43.0068495305261, 144.368746654064 43.0072665496064, 144.36844424313 43.0067096689017, 144.368115816764 43.0061707108935, 144.36952917036 43.0057413937182, 144.36984123885 43.0062947862177)) ^^http://www.opengis.net/ont/geosparql#wktLiteral