Re: [PHP-XML-DEV] Relax NG tricky issue ...

Hi

Here you'll find the right list for such questions:

http://relaxng.org/#mailing-lists ,)

chregu

On 3.11.2004 9:22 Uhr, Mezzophanti wrote:
> Okies,
> 
> Always one to try and push specs beyond their possibilities - I've bumped up 
> against another nasty.
> 
> *Apologies if this is the wrong forum - redirect me with prejudice as 
> required*
> 
> I love Relax NG's ambiguity and some of the things this allows - expecially 
> relating to context-sensitive data modeling.
> 
> Such as having:
> 
>    <attribute name="length"><value>1</value></attribute>
>    <data type="string"><param name="maxLength">1</param></data>
> 
> as a group within a series of such groups (with the numbers changing to 2,3 
> and so on to whatever)
> 
> This allows the maxLength facet to be preset according to whatever value the 
> xml document records for the attribute:
> 
> <myelement length="3">abc</myelement> would therefore validate, whereas:
> <myelement length="3">abcD</myelement> would not (because it has four 
> characters)
> 
> Now ... using this value-based method of context-sensitivity is fine when 
> you know how many value aspects there are (for example if length can be 
> between 1 and 20 inclusive) Buuuuut - not if the number is indeterminant OR 
> if the number is excessively large.
> 
> Is there ANY other method around this that brains out there know of?
> 
> Such as:
> 
>    <attribute name="length"><value>X</value></attribute>
>    <data type="string"><param name="maxLength">X</param></data>
> 
> where X (or whatever syntax we use to reference it) is AUTOMATICALLY set to 
> be the same in each position.
> 
> This way, we are basically using only 2 lines to say that WHATEVER value is 
> given to a length attribute will automatically set that attribute's element 
> maxLength to THAT value.
> 
> Clear?
> 
> Does the compact syntax have an ability to forward reference like this?
> 
> Thoughts? Ideas? :)
> 
> Any and all thoughts welcome ...
> 
> Mezzophanti 
> 

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