メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905665006699 43.4949293241575, 141.904879601767 43.4950505588332, 141.904733159097 43.4945146181677, 141.904705480194 43.4945193525046, 141.904571520796 43.4940179441334, 141.905356214087 43.4938879529129, 141.905503938008 43.4943822635634, 141.905665006699 43.4949293241575)) ^^http://www.opengis.net/ont/geosparql#wktLiteral