メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.36124824084 43.7879783468415, 142.360650676686 43.788419368761, 142.360036334851 43.7888482554388, 142.360021005532 43.7888594343526, 142.358334577303 43.7876170246894, 142.358932527374 43.7871799989471, 142.359543034974 43.7867427523979, 142.36124824084 43.7879783468415)) ^^http://www.opengis.net/ont/geosparql#wktLiteral