David Orchard wrote:

Well, what I meant was that I don't know what down to earth means in
this context, namely for writing a spec.  Down to earth applied to a
policy language specification is absurd.  We need a language that is
unambigous and clear to get to interoperable implementations.
FWIW I found Ian's use of English prose in the HTML 5 parsing spec to be clear and helpful in producing an implementation. There are now multiple implementations of that spec which are believed to have good interoperability (they all pass a common test suite of moderate size).

I have not reviewed the relevant section of the Access Control spec in enough detail to know whether it is currently as clear as HTML 5, but I see no reason /in principle/ why it could not be made clear enough to produce multiple interoperable implementations.

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