[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Why Model Concepts? (Was RE: Object Role Modelling (ORM) or U MLor ?
Excellent! Thanks Ken for saving some of us a lot of time in the weeds of discourse. :-) The first paper is right on. The second is a little foggy but generally, good conceptual models, transform schedules, and smart cacheing go a long way to achieving reuse AND performance. Len http://www.mp3.com/LenBullard Ekam sat.h, Vipraah bahudhaa vadanti. Daamyata. Datta. Dayadhvam.h -----Original Message----- From: Ken North [mailto:ken_north@c...] Different perspectives (conceptual schema, physical schema, user view) were defined in the 70s by the ANSI/X3/SPARC Study Group on Database Management Systems. This paper has an explanation: http://www.nist.gov/sc4/wg_qc/wg10/current/n089/wg10n089.pdf conceptual model: description of the content, the structure, the rules, and behaviour in a universe of discourse This paper discusses the advantages of physical data independence in a hypermedia context: http://www.dke.uni-linz.ac.at/research/publications/abstracts/Prue96c.html ------------------------------------------------------------------ To unsubscribe from this elist send a message with the single word "unsubscribe" in the body to: xml-dev-request@l...
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