type MIP for data types only

Our read of XForms spec says that type MIP is for data types only.

So, what should happen in the invalid case that a form author does attempt 
to associate a complex (structural) type with a subtree node using the 
xforms type mip?

We think the behavior is undefined, so an implementation is free to 
sometimes return true and other times false without reaching 
interoperability with other implementations.

Opinions?

John M. Boyer, Ph.D.
Senior Product Architect/Research Scientist
Co-Chair, W3C XForms Working Group
Workplace, Portal and Collaboration Software
IBM Victoria Software Lab
E-Mail: boyerj@ca.ibm.com  http://www.ibm.com/software/

Blog: http://www.ibm.com/developerworks/blogs/boyer/index.jsp