Re: syntax, model
On Friday 24 October 2003 10:39, Ralph Hilken wrote: > Hello Tyler: > > On Friday 24 October 2003 9:44 AM EDT, Tyler Close wrote: > > please answer the original question: "How exactly does the > > thing described by a schema differ from a data model?" > > This question has been brought up before on this list. It is names vs. > contents vs. context. One person's date is not the same as another's. > Probably the best way to explain it would be to present my challenge: "I > can take your schema and write an XML document that will not meet your > needs, rather my needs". If I were a nice guy, I might tell you what the > document really means, as the schema will never tell you. This has been > done over and over again in business computing, Just To Get The Job Done. > Need to send new data fragments over an agreed upon protocol, but have no > time to redo the schema, or the person that would do that is on vacation? > Then it is time to find new meaning for old fields. If it is important > enough, the schema can be updated at a later date. And so it goes... This can also happen in a data model. I can certainly write code that uses a different interpretation of any member in a C struct. Tyler
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