Providing a Discriminated Union from an F# Type Provider

I've gotten the basics of type providers such as creating a type

let thisAssembly = Assembly.GetExecutingAssembly()
let t = ProvidedTypeDefinition(
           thisAssembly,namespaceName,
           xType.Attribute(xname "name").Value,
           baseType = Some typeof<obj>)

but I need to be able to define record types and DU types is there any way to do this with type providers?