About the Special Alliances in scenarios

[setapdede 238]

I am trying to make a custom Special Alliance (like HRE) for a scenario as I've noticed you can easily change the data for it. Yet I have a question.

I've noticed the following parameter: 

typeOfAlliance

I assume its probably so it knows what reforms it has available for the alliance, so I wanted to ask how many types of these special alliances are there in the game and can we add or change them?

[Łukasz Jakowski 13,390]

Holy Roman Empire or Defensive Alliance

[histroy 10]

What is the difference between the holy roman empire and the defensive alliance 

[Łukasz Jakowski 13,390]

One can make reforms, second one can't

[bizacjum 219]

4 hours ago, Łukasz Jakowski said:

One can make reforms, second one can't

how to make your own reforms ?