XML industry has reached the mountain top: http://news.com.com/Putting+XML+in+the+fast+lane/2100-7345_3-5534249.html?tag=st.prev
If this thing continues, and adds another stupidity on top of a base stack, we'll be back in the 70s.
Processing power and network throughput will handle the load of cross boundary XML being serialized as XML 1.0 + Namespaces. We do not need XML 1.1, which is a flop anyway, and for sure, we don't need another Infoset.
Let the major vendors deliver binary Infoset for intra-firewall scenarios. Every other form of communication mechanism should use the d*mn angle brackets, if it chooses the XML dialect for the payload.