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Re: Question about datatype

From: Henry S. Thompson <ht@inf.ed.ac.uk>
Date: Tue, 09 May 2006 10:33:02 +0100
To: David Landwehr <david.landwehr@solidapp.com>
Cc: xmlschema-dev@w3.org
Message-ID: <f5bslnj1r1t.fsf@erasmus.inf.ed.ac.uk>

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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 09:33:12 GMT

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