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RE: [schema] which assertions can't you express ?

• To: "David RR Webber (XML eBusiness)" <w3c@d...>
• Subject: RE: [schema] which assertions can't you express ?
• From: "Cross, Neal - Senior Developer" <ncross@i...>
• Date: Thu, 9 Sep 2004 14:58:14 +0100
• Cc: "David Carlisle" <davidc@n...>,<xml-dev@l...>
• Thread-index: AcSWaWr0GqMY+I1hSL+81WIJqdLjcQACx6Aw
• Thread-topic: [schema] which assertions can't you express ?

Thanks for all the help on this guys, I will investigate your various solutions and make a proposal to the business.

-----Original Message-----
From: David RR Webber (XML eBusiness) [mailto:w3c@d...]
Sent: 09 September 2004 13:32
To: Cross, Neal - Senior Developer
Cc: David Carlisle; xml-dev@l...
Subject: Re:  [schema] which assertions can't you express ?


Neal,

Those ever popular Excel spreadsheet validation matrix!

OASIS jCAM is designed for this express purpose - providing the means to 
create XML templates of those rules to augment your base schema 
structure validation checks.

The tutorial, jCAM processor links and more can be found at :

 http;//www.oasis-open.org/committees/cam

Enjoy, DW

Cross, Neal - Senior Developer wrote:

>Ahh, thank you David, I got lumbered with this legacy XML and we currently only have an Excel spreadsheet to define the structure :-(
>I will look into your suggestions.
>
>
>-----Original Message-----
>From: David Carlisle [mailto:davidc@n...]
>Sent: 08 September 2004 14:58
>To: Cross, Neal - Senior Developer
>Cc: xml-dev@l...
>Subject: Re:  [schema] which assertions can't you express ?
>
>
>
>  
>
>>Now, how do I create a schema to represent this considering that is is
>>indexed by the attribute value of id? 
>>    
>>
>
>w3c xml schema can't really do anything about that as it can't express
>different content models for section elements depending on its id
>attribute, but Relax NG or schematron (for example) could be used to
>express constraints on such a document type.
>
>
>even w3c schem can express some things, it can't base the content model
>of child elements based on the attribute value but it can base it on its
>possition in the hierarchy, so you could for example state that the top
>level section has to have id="report definition" and that its section
>children have to have id="officers" or ... and that their section children
>have to have ids "name" or  "appointment date" etc.
>You couldn't though express requirements such as 
><section id="name"/> comes before <section id="date of birth"/>
>in W3C schema, unlike relax ng or schematron.
>
>David
>
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