Your examples are all good, Gabriel, and I would probably
concur that some feature is missing. But I do inevitably come
back to asking what the purpose of your encoding is. If the
normalized date is so hedged around with fear and uncertainty,
does it need treating in the formal way which @when, @notBefore
and @notAfter propose?
> "17th July (definitely and precisely). Don't know which year, but
> almost certainly mid-sixteenth century."?
<date>17th July<note type="editorial">Don't know which year, but almost
certainly mid-sixteenth century.</note></date>
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