RE: XML Schemas: the wrong name
I agree that interchange of data objects and ready-to-run information presumes a lot of a priori agreements. On the other hand, it is not hard to use data binding and to generate gets and sets virtual interfaces from the XML data object. Isn't that a transformability aspect? In effect, with the schema, one can create a trivial API by transforming the data object into the interface specification. That is straightforward data binding. What is not transformed is the actual implementation which is the black box handler. It is the transform of lexical description based on the names. Ready to run suggests to me that all of the rules for the conditions under which a transform is applied are known; that is, the binding rules. In layered systems, procedural rules bind layers operationallly, so in a real sense, these procedures call the correct transform based on the event and it is assumed that using workflow modeling and testing, a behaviorally correct system emerges. If it is behaviorally correct (knowledge is as true as it is predictive), then the system functions and the designer need not be concerned with anything more abstract than that. It comes down to identifying similarity based on invariants and aligning the transforms into a goal-directed sequence. What are the other kinds of information? Is it the layering? Perhaps you could detail the concept of ready to run information. Len Bullard Intergraph Public Safety clbullar@i... http://www.mp3.com/LenBullard Ekam sat.h, Vipraah bahudhaa vadanti. Daamyata. Datta. Dayadhvam.h -----Original Message----- From: Steven R. Newcomb [mailto:srn@c...] There is this common wisdom out there that the structure of interchanged information should also be, in effect, the API to that same information. But, in fact, it's only true for a simple subset of the kinds of information that need to be interchanged, and to which APIs must be provided. The fact that the word "schema" is now used to mean "model for interchange objects" as well as "model for ready-to-run information" further hides the important distinctions between the two realms.
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