I would like to know how a single country's OSM data is kept up to date by osmosis. This is not a question regarding the method of doing the update, rather how osmosis does it.
I downloaded the OSM data for a single country and loaded it to a PostGIS database. Next, OSM minutely updates were setup. When I run the update, osmosis correctly updates only the data relevant to that specific country.
However, I can't figure out how it does that without any country or boundary information stored in the database.