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Re: "finite-length sequence" exact semantic

From: Philippe Poulard <philippe.poulard@sophia.inria.fr>
Date: Fri, 04 Apr 2008 11:37:43 +0200
Message-ID: <47F5F6E7.80504@sophia.inria.fr>
To: daniel@veillard.com
CC: xmlschema-dev@w3.org

Daniel Veillard a écrit :
>   For all the XSD-1.0 decimal derived types the lexical representation
> is defined using something like (e.g for byte):
> 
>   http://www.w3.org/TR/xmlschema-2/#byte
>    "byte has a lexical representation consisting of an optional sign followed
>     by a finite-length sequence of decimal digits (#x30-#x39). If the sign is
>     omitted, "+" is assumed. For example: -1, 0, 126, +100."
> 
> Similary it is used for string:
>    http://www.w3.org/TR/xmlschema-2/#string
>     "...The ·value space· of string is the set of finite-length sequences of 
>      characters..."
> 
> from my math antique background an empty sequence is a finite-length sequence.
> But I could be wrong, I doubt it's what expect by the authors since the
> example of minLength explicitely shows how to avoid empty strings ...
>    http://www.w3.org/TR/xmlschema-2/#rf-minLength
> 
> So I guess either:
>   - "finite-length sequence" is not used in a consistent way in the spec
>   - or all those definitions for decimal and derived types need to specify
>     that sequence to be non-empty
> 
> Can someone confirm "" need to be rejected, and if not what the value should
> be associated (0 ?),

what about "+" or "." ?

> 
> I checked http://www.w3.org/2004/03/xmlschema-errata and it's empty, really ??
> 
> Daniel
> 


-- 
Cordialement,

               ///
              (. .)
  --------ooO--(_)--Ooo--------
|      Philippe Poulard       |
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  http://reflex.gforge.inria.fr/
        Have the RefleX !
Received on Friday, 4 April 2008 09:38:23 UTC

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