Connect a rule operator with another rule operator

Is there anybody else that uses the following:

Incoming AND rule operator connecting to any of the following outgoing rule operators: AND / OR / XOR?

Incoming OR  rule operator connecting to any of the following outgoing rule operators: AND / OR / XOR?

Incoming XOR rule operator connecting to any of the following outgoing rule operators: AND / OR / XOR?

Is all the scenarios listed above valid?

I am interested in gaining better understanding of the rules that pertains to allowing for this type of flow from a process perspective.