Dependency Properties with Explicit Interfaces

interface MyInterface : INotifyPropertyChanged
{
    string Text { get; set; }
}

class MyViewModel : MyInterface
{
    private string text;
    public string Text
    {
        get { return text; }
        set
        {
            if (text != value)
            {
               text = value;
               // TODO: Raise the NotifyPropertyChanged event here
            }
        }
    }
}

interface IViewModel
{
    string Text { get; set; }
}

public static readonly DependencyProperty TextProperty =
    DependencyProperty.Register("Text",
        typeof(string), typeof(IViewModel));

public static readonly DependencyProperty TextProperty =
    DependencyProperty.Register("Text",
        typeof(string), typeof(ImplementingClass));