LinqToXml does not handle nillable elements as expected

Question

According to W3C standards, if you have a nillable element with a nil value, you are supposed to format it like this:

Answer 1

You could also do something like this, taking advantage of the null coalescing operator:

public static object Nil
{
    get
    {
        // **I took a guess at the syntax here - you should double check.**
        return new XAttribute(Xsi + "nil", true);
    }
}

// ......

object nullableContent = ...;
element.Add(
    new XElement(NS + "myNillableElement", nullableContent ?? Nil)
    );