RE: DTD ( From Eliotte Rust Harold's Book)
Thank you Sean for your valuable feedback. It really set me thinking. Also, With apologies to the Author of XML Bible, the name should read Eliotte Rusty Harold. I regret the typo caused. Regards, Praveen Zala -----Original Message----- From: Sean McGrath [mailto:sean.mcgrath@p...] Sent: Thursday, September 27, 2001 3:28 PM To: xml-dev@l... Subject: Re: DTD ( From Eliotte Rust Harold's Book) Praveen Zala, 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 it. Leave this validation to a post XML-validation filter written in your chosen programming environment. 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 syntax. 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. Sean > -----Oorspronkelijk bericht----- > > Van: Zala, PraveenKumar [mailto:praveenkumar.zala@d...] > > Verzonden: donderdag 27 september 2001 9:40 > > Aan: xml-dev > > Onderwerp: 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 >DIVISION > > 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 ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this elist use the subscription manager: <http://lists.xml.org/ob/adm.pl>
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