Writing out FlowDocument xaml with namespace using XmlWriter - wpf

Question

I've got a collection of data that needs to be converted to a .xaml file that can later be loaded as a FlowDocument into a FlowDocumentReader. I don't directly instantiate Paragraphs, Runs, rather I generate the xaml to create the document later.
What I've tried:
I iterate through the data, creating XElements for Paragraphs, Runs, InlineUIContainers, etc. and build up the FlowDocument structure just fine and then call:
XmlWriter writer = XmlWriter.Create("output.xaml");
flowDocElem.WriteTo(writer);
writer.Close();
In the consuming app, I do this:
flowDocument = XamlReader.Load(xamlFile) as FlowDocument;
flowDocumentReader.Document = flowDocument;
xamlFile.Close();
But the loading fails because it doesn't know what a FlowDocument is. The FlowDocument element looks like so:
<FlowDocument Name="testDoc">
(There's no namespace there to shed light as to what a FlowDocument is when it is read in.)
If I hand edit the .xaml and modify the element to be:
<FlowDocument xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
Name="testDoc">
Then it'll load just fine.
When creating the XElement for the FlowDocument, I've tried to do this:
new XElement("FlowDocument", new XAttribute("Name", "testDoc"), new XAttribute("xmlns", "http://schemas.microsoft.com/winfx/2006/xaml/presentation"));
but that doesn't work either - gives me an error if I try to create the namespace attribute.
I can completely cheat and stuff that xmlns into the element and then call something like
File.WriteAllText("output.xaml", fixedTxt);
but that feels dirty and so I think I'm just plain doing it wrong.
Thoughts?
Update:
While this probably isn't the prescriptive solution to the problem, it does work:
By adding a ParserContext to the XamlReader, I was able to get past the problem with loading the FlowDocument xml.
FileStream xamlFile = new FileStream("output.xaml", FileMode.Open, FileAccess.Read);
XamlReader x = new XamlReader();
ParserContext parserContext = new ParserContext();
parserContext.XmlnsDictionary.Add("","http://schemas.microsoft.com/winfx/2006/xaml/presentation");
flowDocument = XamlReader.Load(xamlFile, parserContext) as FlowDocument;
flowDocumentReader.Document = flowDocument;
xamlFile.Close();

Answer 1

Try using XamlWriter instead of XmlWriter.

Answer 2

If you use XLinq you should try the following:
XNamespace ns = #"http://schemas.microsoft.com/winfx/2006/xaml/presentation";
XNamespace xns = #"http://schemas.microsoft.com/winfx/2006/xaml";
XElement someElement = new XElement(ns + "FlowDocument",
new XAttribute(xns + "Name", name),
...);