F # TypeProvider "XMLProvider" provides a System.Exception

Question

I am trying to process Twitter tweets using the XML type provider below. The code works fine when accessing data tweet values ​​using LINQ XElement functions, but this error excludes the statement: "XML mismatch: exactly one child header was expected when using the type created by XMLProvider. I know that namespaces are not defined, however, I do not know how they will be specified with the provider if they are needed.

// ... open FSharp.Net open FSharp.Data let ns = "http://www.w3.org/2005/Atom" // General helpers for XML let xelem s (el: XContainer) = el.Element(XName.Get(s, ns)) // ... let xvalue (el: XElement) = el.Value let twitterUri = "http://search.twitter.com/search.atom?q=Windows8&rpp=100&lang=en" type Tweets = XmlProvider<"SampleTweets.xml", Global=false> let feed = Tweets.Load twitterUri // title 0 & 1 produce correct values let title0 = feed.XElement |> xelem "title" |> xvalue let title1 = feed.XElement |> xelem "entry" |> xelem "title" |> xvalue // title 2 produces: "XML mismatch: Expected exactly one 'title' child" let title2 = feed.Title let title3 = feed.GetEntries().[0].Title 

Answer 1

This was an error in FSharp.Data, because there is a default namespace in xml xmlns="http://www.w3.org/2005/Atom" .

Version 1.1.3 fixed this, but you can also do the following as a workaround:

 [<Literal>] let twitterUri = "http://search.twitter.com/search.atom?q=Windows8&rpp=100&lang=en" type Tweets = XmlProvider<twitterUri> let feedXml = (Http.Request twitterUri).Replace("xmlns=\"http://www.w3.org/2005/Atom\"", null) let feed = Tweets.Parse feedXml let t = feed.Title