[Tagging] new key civilization

M∡rtin Koppenhoefer dieterdreist at gmail.com
Wed Jan 12 00:35:23 GMT 2011

2011/1/11 John F. Eldredge <john at jfeldredge.com>:
> Perhaps one could have separate tags for civilization and era.  After all, many of these civilizations overlapped to some degree, timewise, while being in different parts of the world.  In some cases, the different civilizations traded with each other (for example, the Roman and Chinese civilizations traded with each other, through intermediaries).

yes, era is not what I am looking for. I used to tag the time
component (in rare cases) with the key "period", e.g. period=aurelian
for one of the city walls of Rome:


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