10. The computer-readable storage medium of claim 8 , wherein defining the relationship further involves expressing the strength of the relationship between the initial tag and the second tag using a percentage scale.
11. The computer-readable storage medium of claim 10 , wherein defining the relationship involves specifying one or more of the following: that the initial tag and the second tag are unrelated; that the initial tag and the second tag specify loosely-related concepts; that the initial tag and the second tag specify closely-related concepts; and/or that the initial tag and the second tag are synonymous.