Rob Relyea pointed out in his latest blog Rob’s Blog that Microsoft has created a schema for the Windows Workflow Foundation specific elements of XAML. If you recall from one of my earlier blogs  WF XAML vs Code I mentioned there was no support for intellisense in the editor which made it a little difficult to do any coding with XAML. I just downloaded the XSD Schema and tried it out. It’s like I am coding in WPF! Thanks Rob for pointing this out.