19 periods missing structured descriptions of temporal coverage about periodo-data HOT 5 CLOSED

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Most of these are just oversight, and I can fix. But the periods from the Arena ADS collection are a little more complicated. They were based on graphic timelines than ran up to "the present" and faded out, so there was no clear expression of an endpoint. A few also didn't have clear beginning points. How should we handle this? Can we have four-part dates with an indeterminate earliest or latest figure -- e.g. the modern period has earliest stop 2004 (when the ADS interface was posted), latest stop blank?

This is fixable more easily for the uncertain beginnings -- I can go back and look at my screen-grabs (the site doesn't exist any longer) and set earliest/latest starts. But in general, how do we handle the moving goalpost of "the present"?

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They were based on graphic timelines than ran up to "the present" and faded out, so there was no clear expression of an endpoint … in general, how do we handle the moving goalpost of "the present"?

Good question; I'm surprised this hasn't come up before. I think the proper way to handle these would be to record them as temporal ranges that have a start interval but no stop interval. So a timeline that visually indicates "continues indefinitely into the future," or a sentence like "The Anthropocene began on July 16, 1982 and has not yet ended" would both be represented having no stop interval.

The client probably expects definitions to have stop intervals, though, so if we were to allow this we'd need to investigate the consequences in terms of breaking the client.

I don't think there's a use for temporal ranges with no start interval, is there?

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Related to periodo/periodo-client#150

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These have been fixed, and we now allow periods without stop intervals.

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