RESOLVED vs CLOSED

[Hugo Pereira Da Costa]

Hello all,
sorry for this newbye question.
I was pointed out that RESOLVED bugs on bugs.kde.org can be further tagged as 
CLOSED. ... which I did not know.

Right now, there are 432 bug reports related to oxygen which are RESOLVED, but 
not CLOSED. 

What exactly is the policy on tagging them as CLOSED, with respect to RESOLVED 
? (so far I've been using the second pretty much in place of the first) 

Should I go through all of them and CLOSE them ? Or just the ones that are 
only FIXED, or INVALID, or UPSTREAM ? 

Thx,

Hugo