メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.052876162667 42.9110479057157, 143.05359917235 42.9110956561049, 143.053456479997 42.9122640328733, 143.052689780098 42.912205334191, 143.05197792682 42.9121409016981, 143.052113387747 42.910995436409, 143.052876162667 42.9110479057157)) ^^http://www.opengis.net/ont/geosparql#wktLiteral