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RE: [xml-dev] 2 questions about Relax NG: ID/IDREF datatype and whitespace facet

The interesting questions 

1.  Are such ratios common?

2.  Why do some designs or domains have such high proportions of metadata
entities to data entities?


From: Peter Hunsberger [mailto:peter.hunsberger@gmail.com] 

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

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...

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