Doc page about query semantics and visible time range

[teh-cmc]

We need a page in the docs that explain query semantics and their relationship to the visible time range feature.

[teh-cmc]

See also my last answer on the matter:

Is there documentation on how the “Visible Time Range” feature is supposed to work?
I'm seeing the surprising behavior that setting it to a nonempty range causes fewer objects to be visible than if the range is a point (current + 0 to current + 0), and I'd assume that's a bug, but I don't see any description of its actual semantics.

That doesn't necessarily sound incorrect (although it might still sound surprising :D).

The default query (called "latest-at") will wall backwards in time until it finds data. I.e. LatestAt("my/entity", Point3D, Time(10)) might return data a Time(7) if there was no Point3D logged between 8 and 10.
A range query on the other hand (which is what you get when you enable visible time range) just walks forwards in time without any kind of backtracking. I.e. if you log a Point3D at 7 and then do a Range("my/entity", Point3D TimeRange(8, 10)), you will not find anything (a Range("my/entity", Point3D TimeRange(7, 10)) would, though).