メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.440434635697 43.8089345130273, 142.439914787087 43.8094052202526, 142.437737589987 43.807976384742, 142.437925222576 43.8078248010545, 142.43938549797 43.8066000361797, 142.44149964808 43.8079701582766, 142.440434635697 43.8089345130273)) ^^http://www.opengis.net/ont/geosparql#wktLiteral