emacs 'Remember' is a mode for remembering data. It uses whatever back-end is appropriate to record and correlate the data, but its main intention is to allow you to express as little structure as possible up front. If you later want to express more powerful relationships between your data, or state assumptions that were at first too implicit to be recognized, you can 'study' the data later and rearrange it. But the initial 'just remember this' impulse should be as close to simply throwing the data at Emacs as possible.