What is the best place on Stack Exchange to ask specific questions about the proper use of notations used in UML and other modeling languages?
This question might seem like a possible duplicate of the following question: Where is the best place to ask for a sanity-check on a UML diagram?. But please note that I am not interested in getting an entire UML diagram reviewed. Rather, I am looking to ask specific questions about how to build software architectural or design models using UML or other modeling notations, with concrete examples at hand.
A simple example of one such question would be (and I am not expecting answers) -
"When would one use a return message in a sequence diagram in UML?"
Or at least something to that degree. Of course, there should be more detail with example UML sequence diagrams.