メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.053330638577 42.9133525339098, 143.051840096802 42.9132587425944, 143.051799207983 42.9132563558873, 143.05197792682 42.9121409016981, 143.052689780098 42.912205334191, 143.053456479997 42.9122640328733, 143.053330638577 42.9133525339098)) ^^http://www.opengis.net/ont/geosparql#wktLiteral