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

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Sun uses it in the schema for web app deployment descriptors:


I use it to ensure a a page referenced by a folder/@index_page is in the 
folder, for example:

<folder id="f123" index_page="p234">
  <page id="p123"/>
  <page id="p234"/>


Priti Patil wrote:

>Are you sure that these schemas are from real world i.e. these are
>actually used in the application. Those should not be the sample schemas
>which are generally designed for explaining the concept.
>Can you provide more details?
>Thanks and Regards,
>Priti Patil.
>On Fri, 2004-08-13 at 17:42, 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


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