17. The apparatus of claim 15 , wherein defining the relationship further involves expressing the strength of the relationship between the initial tag and the second tag using a percentage scale.
17. The apparatus of claim 15 , wherein defining the relationship further involves expressing the strength of the relationship between the initial tag and the second tag using a percentage scale. 18. The apparatus of claim 17 , 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.