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

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> 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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