From: Bruce D'Arcus
> So we're introducing natural language to the spec to indicate
> structured data. That seems like a potentially highly controversial
"unknown" and "open" are reserved words with specific meaning and they are the only reserved words that can be used in this context. I don't think that's "natural language".
> I'd prefer keep this all as simple as possible, but at least consistent.
> So, I'd prefer not to allow these sorts of modifiers at all on
> intervals, and just allow:
> E.g. an interval with an unspecified closing date.
> Perhaps, depending on how the other discussion goes, we could also
> allow something like:
Fine with me.