How to design a Semantic Wiki to best understand the concept of Time

What you're talking about at the end is, essentially, three-dimensional data: land area for country, for year, for viewpoint. 

Not really. I mean that the metaproperties for context (time and viewpoint) should be included in the same subobject as the properties. This allows any number of dimensions.

you would presumably want the system to find the nearest year 

I can record intervals: '''Kosovo''' ... {{#subobject:__since = 2008|__until = 2015|__who thinks so = Spain|legal status = Independent state}}.

Alexander Mashin^talk

Ah, yes, that's true. It would be somewhat awkward, but doable.

Yaron Koren (talk)