open System.Xml

​

let namespaces : seq<string[]> = 

    [

        [|"rdf"; "http://www.w3.org/1999/02/22-rdf-syntax-ns#"|]

        [|"metabolite"; "https://metabolon.com/metabolite#"|]

        [|"base"; "https://metabolon.com/schema#"|]

        [|"owl"; "http://www.w3.org/2002/07/owl#"|]

        [|"nlm"; "https://www.nlm.nih.gov/databases/nlm#"|]

    ] |> List.toSeq

[<EntryPoint>]

let main argv =

    let xdoc = XmlDocument()

    let nsmgr = XmlNamespaceManager(xdoc.NameTable)

    namespaces |> Seq.iter nsmgr.AddNamespace

    0