[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Data storage, data exchange, data manipulation
Uh, oh, this is starting to sound a lot like ASN.1! Cheers, Tom P [Jeff Lowery] > I think it was Tom Passin who pointed out the distinction between conceptual > and physical data models. This would imply conceptual as well as physical > schemas, although I think all schemas to date are schemas that model a user > domain with some physical representation in mind. Can there be a conceptual > Schema? UML may get us close to defining one, but even there I think UML is > tainted by physical model pollution in subtle ways. > > So a conceptual schema independent of physical representation is conceivable > to my mind. That representaion would then be transformed to various physical > schemas, although probably not isomorphically. > > Now, the rules for defining a conceptual schema based on business domain I > think could be formalized, just like database schemas normalization rules > are formalized. I think a conceptual schema would model a physical reality > in the same way that mathematics models a physical reality (plus some > surreality for good measure). > >
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