[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: 2 questions about Relax NG: ID/IDREF datatype and whitespa
On Nov 15, 2007 2:31 PM, Len Bullard <len.bullard@u...> wrote: > Dave also sent me that. To do otherwise would have been to give DTDs a > longer lifespan. It confirms comments made on this list along the way about > the necessity of creating minimal standards and really, minimal systems. > > KISSGodzRule: Any feature acquires a use case somewhere and becomes almost > impossible to remove post hoc. > > As I sit here planning a 'features complete' release of a CAP-conforming > health alerting system, I marvel at the truth of that. > > Here's something for you to ponder: what percentage of a database entity > design (and consequently, supporting forms, business classes etc) should > support domain-lookups (eg, metadata) vs operational data (ie, business > data)? It's not a trick question but the answer affects product planning > and standards planning. > I had sent this reply to Len off list, but it's sort of an interesting debate so here it is again: If you're collecting research data then, off hand, I'd say about 90%+: we're using a strongly typed version of a EAV model, only 5 tables out of the 40 or so involved in the model actually collect the actual data. I had figured Len would come in high but not that high, instead he agreed. I actually think we can drop that ratio by recursively using the data tables to store the metadata; sort of an uber schema. There seems to be a belief in some circles that such a design result in a lot of extra joins, but in my experience if it's done right that's not particularly true... -- Peter Hunsberger
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