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Re: [xml-dev] DTD ( From Eliotte Rust Harold's Book)
- From: Sean McGrath <email@example.com>
- To: firstname.lastname@example.org
- Date: Thu, 27 Sep 2001 10:58:24 +0100
How volatile is the "between 4 and 6" constraint?
How likely is it to get more complex over time?
e.g. "between 4 and 6 in the first DIVISION but
6 and 10 in the second" etc.
If this volatility exists, I'd urge you to be
pragmatic. Do not try and enforce this constraint
in the DTD and do not spend time looking for
DTD replacements that allow you to enfoce
Leave this validation to a post XML-validation
filter written in your chosen programming
That way you will never run out of steam as your
constraints get more complex. You will
not hit any wall such as you will hit with any
declarative validation technique.
Get your system to work first. THEN, as the
system settles down,you will be in a position to
decide what parts (if any) of the constraints
checking can be migrated to a declarative
This delayed approach also gives the XML world
time to settle down on the issue of validation.
It is far from settled at the moment e.g.
XML Schema, Relax, XLinkit, Schematron and
so on, all have pros and cons and consensus
seems very far away.
> -----Oorspronkelijk bericht-----
> > Van: Zala, PraveenKumar [mailto:email@example.com]
> > Verzonden: donderdag 27 september 2001 9:40
> > Aan: xml-dev
> > Onderwerp: [xml-dev] DTD ( From Eliotte Rust Harold's Book)
> > Hi,
> > Suppose I am writing a DTD to have between 4 and 6 TEAM elements for a
> > DIVISION element, how do I go about specifying this ?
> > Please note - I cannot have three nor seven TEAM elements for the
> > in my Document, such a document must be forced
> > to be treated as invalid.
> > Hint : I can try to enforce the same above by grouping TEAM elements in a
> > sequence, but still, I have cracked this to atleast
> > have 4 elements but not the second criterion
> > Please get back with your suggestions.
> > Thanks and Regards,
> > Praveen Zala