How exactly do missile defenses work?

From my experience so far in Endless space, i know that when your missile fires(one salvo per battle phase) there are 3 parts in each battle phase(those parts are like fire from kinetic cannons 3salvo's per BP). So do the flak defense it fires 3times per BP to enemy missiles targeting the ship which holds flaks(wont target missiles heading towards other ship).

Summarizing:

1. I have no idea what is written in Xml files, But i do know that there are 3rounds in each Battle phase.

2. lasers and kinetics fire 3 times per BP(battle phase) along with flak defenses which arent displayed per round but instead at the end of BP in way how many missiles was destroyed, just before explosion.

3. I am not sure how does evasion/interception works, because i dont know if what they are showing in game is already multiplied by 3(number of rounds) or it is not. But my quess would be that, one flak(5interception) fired against one missile(7evasion) has 5/7 chance to destroy incoming missile(71,4%). Now the question is - is it a chance given per round or per BP?

I would not say that extra interception is wasted. During my encounters with hi-end ships against low-end ships has shown that few good flaks can well defend a ship against dozens missiles of low evasion.

Hope it helps a bit though im not willing to bet my hand on the third theory :)