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It turns out that attribute-value pairs are quite useful in theorising about programming languages as well as designing practical systems. See "A semantics of multiple inheritance", Luca Cardelli, Information and Computation, 76(2/3): 138-164, February 1988, available here as PDF. Should we mention this in the article? Cheers, CWC(talk) 01:32, 28 August 2006 (UTC)