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   RE: [xml-dev] CDATA section or text node data type

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>Then you define the constraints at the level of elements and
attributes, not at the level of text nodes. 
Currently I have implemented as an attribute. But I require it to be in
CDATA section as the length would be bit more.


-----Original Message-----
From: Michael Kay [mailto:mike@saxonica.com] 
Sent: Friday, April 22, 2005 4:52 PM
To: Baisak, Ranjan; 'David Carlisle'
Cc: xml-dev@lists.xml.org
Subject: RE: [xml-dev] CDATA section or text node data type

> Well I am using w3c specified schema language. 

Then you define the constraints at the level of elements and attributes,
not at the level of text nodes.

Michael Kay

> <![CDATA[aaa]]> does specify whether aaa is a text data or numeric 
> data.
> It is imperetive that Schema should provide more control over DTD and 
> as a user I need some constraints to be there when I can have some 
> data as CDATA or Text node so that I can have the controle of incoming

> data.
> This inturn help me when I am working data base applications and I 
> expect that whatever there in CDADA or Text node is a numeric or byte 
> etc...
> regards,
> -Ranjan
> -----Original Message-----
> From: David Carlisle [mailto:davidc@nag.co.uk]
> Sent: Friday, April 22, 2005 4:29 PM
> To: Baisak, Ranjan
> Cc: xml-dev@lists.xml.org
> Subject: Re: [xml-dev] CDATA section or text node data type
>   Please have a thought. If this feature is already available then 
> please
>   let me know so that I can implement it.
> a CDATA section is just a syntactic convenience, 
> <x><![CDATA[aaa]]></x> means exactly the same as <x>aaa</x> so schema 
> languages do not allow any significance to be placed on CDATA 
> sections, just as they do not allow significance to be placed on 
> whether " or ' is used to surround an attribute value: <a b="2"/> 
> means the same as <a b='2'/>.
>     sometimes we need some sort
>     of constraints to be there to check data type before manipulation.
> Most schema languages (other than DTD) allow constraints to be placed 
> on text node children of elements (which then apply whether or not the

> author has used the CDATA section syntax) W3C XML Schema, Relax NG, or

> Schematron for example could all specify a constraints of various 
> sorts on the content of elements.
> If you said what schema language you were using, and what types of 
> constraints you wanted to enforce, someone would be able to offer 
> advice.
> David
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