Didn't you ask this yesterday as well?
You might haven't got answers because, possibly, the XML experts didn't see your post. This is a user-to-user forum, it's not like there is a staff waiting for questions to pop up and immediately answer.
It's also possible your question was too vague. I'm not one of the XML experts so I might be wrong, but I have no idea of what the issue is. What 'controls'? What is a 'designer form'? I've never seen one in InDesign (it might be you are using an unusual name for a perfectly logical subject).