メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.405753958583 43.0142816618799, 144.404882498947 43.0137141362484, 144.403550056293 43.0128715739396, 144.403490473347 43.0128339439648, 144.403087860124 43.012573075113, 144.404235690931 43.011640511073, 144.40687423764 43.0133452300525, 144.405753958583 43.0142816618799)) ^^http://www.opengis.net/ont/geosparql#wktLiteral