- 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
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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 UTC