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Hi Paul, Mike,
>Two databases may
>use different identifiers for what is in fact the same concept, such as
>zip code. A program that wants to compare or combine information across
>the two databases has to know that these two terms are being used to
>mean the same thing.
Isn't that the whole crux of the problem? If the problem is that two
databases (or web pages) use a different name for "zip code", the solution
is to add a third (Q)name, that both must agree upon?