Question

What does “Designate an initial state in every concurrent region of a concurrent composite state” mean?

(a) If there are no transitions to a concurrent composite state’s boundary, then concurrent regions do not need to have initial states

(b) A transition to the composite state’s boundary could be added later, though, so initial states for each region should always be specified

(c) It is legal to transition directly to more than one sub-state of a concurrent composite state without going through a fork

(d) All of the mentioned

This question was addressed to me in semester exam.

I would like to ask this question from Advanced UML State diagrams topic in section Unified Modelling Language of Software Architecture

Answer 1

Correct option is (d) All of the mentioned

The explanation: If there are no transitions to a concurrent composite state’s boundary, then concurrent regions do not need to have initial states and a transition to the composite state’s boundary could be added later, though, so initial states for each region should always be specified.