Thanks about your note.
Well, Corine data is not greatest and newest data set. But I try to make Finnish OSM more useful.
This natural=wood / landuse=forest is pretty much (forest) political discussion. So, I decided to follow previous import, so all Corine data will use same tagging.
clc:code, maybe not so important, but may help later on when somebody is correcting / replacing this import.
Maastotietokanta: this still under a dicussion in Finnish community. But for me it is obvious that National Land Survey of Finland datasets will be imported to be part of OSM.
However Maastotietokanta don't have forestry polygons: Generally in Finland: everything what is not mapped = forest ;-)