Clarification needed with entity declaration

Getting Started with Rasa
1

The Rasa docs here have an example with these two lines of sample sentences:

- how much do I have on my [savings](source_account) <!-- entity "source_account" has value "savings" -->
- how much do I have on my [savings account](source_account:savings) <!-- synonyms, method 1-->

What causes that in one example the intent type is simply “source_account” while in the other it’s “source_account:savings”? In this particular example why can’t both be the same, since “savings” is named in both cases?

2

It is just another syntax to define synonyms. In the second case, we are just saying savings account is a synonym for savings.

3

My question is rather about the part in the ( ) parentheses. That section is the data that will go into the functions. So why do we have to declare them differently if they’re referring to the same thing?