メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.761964181722 43.1939901010384, 141.761427095178 43.1945460041277, 141.760441752953 43.1940269189447, 141.761794356974 43.1926099672312, 141.762810691827 43.1931648255154, 141.761964181722 43.1939901010384)) ^^http://www.opengis.net/ont/geosparql#wktLiteral