メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.262432540525 44.0275608497282, 144.262095515025 44.0280842474269, 144.260784309751 44.0276167941552, 144.261138611788 44.027108460633, 144.262432540525 44.0275608497282)) ^^http://www.opengis.net/ont/geosparql#wktLiteral