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Re: Question about datatype

From: David Landwehr <david.landwehr@solidapp.com>
Date: Tue, 09 May 2006 11:45:31 +0200
Message-ID: <446064BB.5000307@solidapp.com>
To: "Henry S. Thompson" <ht@inf.ed.ac.uk>
Cc: xmlschema-dev@w3.org

Hi,

Thanks for the answer. I have send the link to this answer out on 
www-forms in the hope it will help the discussion. The explanation did 
help my understanding.

Best regards,
David

Henry S. Thompson wrote:
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> In W3C XML Schema, datatypes are to a certain extent an abstraction --
> the combination of a lexical space, a value space and a mapping
> between them -- that is meant to be usable via a range of concrete
> mechanisms.
>
> W3C XML Schema itself has such a concrete mechanism:  the Simple
> Type Definition component.  This in turn may appear and function in
> three contexts:
>
>  1) As the {type definition} of an Attribute Declaration;
>  2) As the {type definition} of an Element Declaration;
>  3) As the {content type} of a Complex Type Definition (which itself
>     will typically be the {type definition} of an Element
>     Declaration).
>
> The validation semantics of (1) -- (3) are all defined in terms of
> properties of the corresponding datatype.
>
> Hope this helps,
>
> ht
> - -- 
>  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
>                      Half-time member of W3C Team
>     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
>             Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
>                    URL: http://www.ltg.ed.ac.uk/~ht/
> [mail really from me _always_ has this .sig -- mail without it is forged spam]
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Received on Tuesday, 9 May 2006 09:45:27 GMT

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