What is this part called in &summon

[kyleflow 34]

Hi guys, in GM command, we use it like this right. &summon <CharacterInfoID>, SetChaLifeTime, <the aggressive nature of mobs>

For the aggressive nature of mobs, what is it called? Like SetChaLifeTime, we can simply specify the parameter in function like this.

SetChaLifeTime = (CharacterInfoID, <value> )

So for the aggressive part, how do I specified it.