メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.369786760661 43.7625134565331, 142.369798288293 43.7625344342321, 142.370104535283 43.7630911994785, 142.368590182614 43.7635110835397, 142.368293744976 43.7629461298008, 142.368287145156 43.7629335674382, 142.367948577585 43.7623675475378, 142.369462918487 43.7619489544935, 142.369786760661 43.7625134565331)) ^^http://www.opengis.net/ont/geosparql#wktLiteral