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Possible Duplicate:
Should I retag a question with a tag that is based on the answer and not the question?

I am curious if a question should be edited to have a tag removed in the following situation:

The hypothetical question is tagged as a PHP/LibraryX question, in which the user is experiencing some behavior. The answer is revealed to be an issue with RegEx/PHP and not something having to do with the library at all.

As a result, when searching for the Library and reading this answer, I'm given a false positive. I am curious if this is worth re-tagging, since the problem isn't actually one with the knowledgebase.

Follow up bonus question. Should questions have tags added to them based on their answers? I'm thinking for Archival purposes.

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marked as duplicate by Josh Caswell, Manishearth, hims056, Martijn Pieters, Toon Krijthe Jan 4 '13 at 7:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

The answer to the "bonus question" certainly matches the Possible Duplicate, but I'm more curious if I should be removing a tag which doesn't have to do with the question, once the answer is found. – DaOgre Jan 4 '13 at 0:31
up vote 3 down vote accepted

Yes, it's perfectly fine to retag in this situation, however I advise using the full editor for this and adding an appropriate edit note. I tend to use wording like

This is not actually a $FOO-related problem

This allows future editors to see the intent behind the removal. Adding tags is a bit more sticky, as you don't want to put words in the author's mouth.

While you have the full editor open, you should always see if there's anything else worth fixing, of course.

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