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   Re: [xml-dev] Constrain the Number of Occurrences of Elements inyour XML

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Pete Cordell wrote:
> Someone mentioned the word 'combinatorial', but I couldn't find the 
> e-mail it related to.  In case it refers to a different combinatorial to 
> the one I'm thinking of,...

That was me ...

> the problem I've encountered with fixing limits is when multiple nested 
> structures have non-unity cardinality.  For example, a book may have a 
> number of volumes, which have a number of chapters, that have a number 
> of sections, that have a number of sub-sections, that have a number of 
> paragraphs, and which have a limit on the maximum number of characters 
> in a paragraph (e.g. a string constraint).
> If you assign a reasonable number to each level, by the time you 
> multiply it all out, you get a huge number that probably doesn't help 
> you.  If you try to limit the maximum size to something useful, your 
> 'local' limits end up too small to be useful.

You've given a very nice example of the kind of thing I was thinking about.

Tom P


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