It seems to me that asking a question that had been previously asked isn't very welcome in forums like stackoverflow. The logic behind this is clear: DRY (don't repeat yourself). In general I agree to this rule, but I think sometimes there are exceptions to this rule.
For example, I have just read a question in stackoverflow with title "Well designed Django example code to learn from". Actually there are some good answers to this question.
But I think this kind of questions should be asked again periodically, because there is not a unique true answer to them. There might be new additions to good django codes. There might be some people who know very good answers to the question but who missed the question when it was asked first time.
So my question is: If someone asks a previously asked question that has no unique answer, after some period of time, will it be treated as offensive?