Hmmm, MediaWiki is on the right track storing different aspects of an article in different MySQL database tables, if this model from nature is to be followed.

"Each rat was shocked while a drug was injected into three parts of the brain. Two days later their memory of the bad experience was tested, and the drugs revealed what parts of the brain were at work.

The findings: The hippocampus is involved in processing memory for context; the anterior cingulate cortex deals with retaining memories of unpleasant stimuli; the amygdala consolidates memories more broadly and influences the storage of both contextual and unpleasant information."

http://www.livescience.com/health/060202_thoughts_scattered.html