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BNF for the dateTime spec is reasonably straightforward, except for representing INTERNAL uncertain/approximate.

Thus it is easy to incorporate
	2004-06?
	2004-06-11?
	2004-06~
	2004-06-11~
etc.

But more complex to support things like
2004-(06)?
(2004)?06-11

or even:
(1985-12~)?

Not impossible but it will make the overall BNF less readable. 

I'd like opinions on whether we really need these, or can they be dropped.

--Ray