Just wrote a lengthy exposé about this subject. Bottom line:
- It doesn’t matter much, because your registry seems local, and therefore not analyzable in a network session.
- So, I’d just write Observation concepts for the question, and either answer concepts for the answers if they are controlled, or value_as_as_string if open ended.
- I would map the useful question/answer pairs to proper concepts and record them there
- Don’t worry about linking, people trust what you are ETLing.