Re: 7.1 and 7.3 are as bad as XML Schema

James Clark wrote:

> I agree that there is scope for improvement in 7.1, but I don't agree with
> you about 7.3.  I think the informal concept is very straightforward, and I
> don't think the formalization is any harder than section 6.

Let's begin with some facts.  Who in the TC understands 7.4 and likes it?
Apparently, James does and I don't.  How about other members?

If you claim that you understand 7.4, please give non-trivial examples of 
key-ambiguous grammars.  > each member

Cheers,

Makoto