Re: Separation of Relational Engine from Domain Math

topmind wrote:
> I have not seen much info about how and whether the "expression engine"
> can or should be considered orthogonal to the "relational engine", as
> long as a minimum set of requirements are met. It seems the relational
> engine only needs a way to know how to interpret expressions into
> Boolean values. Thus, any math that can produce or be interpreted as
> Boolean can be "inserted" into the relational domain. Beyond that, the
> sky is the limit. What the "cell types" are is also up to the domain.
>
> Does anyone know of Dr. Codd or C. J. Date work on such separation?

C. J. Date and Hugh Darwen: "Databases, Types, and the Relational Model (The Third Manifesto)" is exactly what you are looking for, I think.

-- 
Jon