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   Re: [xml-dev] Are people really using Identity constraints specified

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So in this sample, 5.3 percent of schema documents used identity 
constraints. Do these schemas have anything in common - do they come 
from similar application domains?


Henry S. Thompson wrote:
> I have a collection of slightly over 1000 distinct schema documents
> culled from the web, which I'll be describing and releasing soon.  I
> just checked, and conservatively the numbers are as follows:
>   schema documents using key, keyref and/or unique:  53
>   uses of unique:                                   105
>   uses of key:                                      179
>   uses of keyref:                                   229
> ht


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