I am wondering about this too! Ignorantly speculating (another reverse learner here), I'm wondering if it is literally:
A community, that is important.
"Itu" is to put emphasis on "A Community". If you write "sebuah komunitas penting" it will means "An important community."
What is the function of 'itu' in this sentence?
i think no.. :P
Kenapa bukan a community the important ?
"Itu" it's refers to subject