メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904879601767 43.4950505588332, 141.904096294947 43.4951714783519, 141.903796573258 43.4941494013319, 141.904571520796 43.4940179441334, 141.904705480194 43.4945193525046, 141.904733159097 43.4945146181677, 141.904879601767 43.4950505588332)) ^^http://www.opengis.net/ont/geosparql#wktLiteral