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Re: xsi:type

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 29 Oct 2002 14:01:21 +0000
To: Joe Forrest <curiousmejf@yahoo.com>
Cc: xmlschema-dev@w3.org
Message-ID: <f5bhef5gx8u.fsf@erasmus.inf.ed.ac.uk>

Joe Forrest <curiousmejf@yahoo.com> writes:

> Hi All,
> 
> Will the uniqueness be enforced on "isbn"?
> 
> <?xml version="1.0"?>
> <books
>   xmlns="store"
>  
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>   xsi:schemaLocation="store books.xsd">
>   <isbn xsi:type="xsd:decimal">1234.0</isbn>
>   <isbn xsi:type="xsd:decimal">1234</isbn>
> </books>
> 
> where, the type of "isbn" is declared as
> "anySimpleType" in books.xsd

Good question, presuming books.xsd (which you didn't include) makes
. a key for <isbn> within <books>.

I think the answer is 'yes', that instance should raise an error --
the values are the same.  xsi:type functions to establish a type for
an element prior to all notions of PSVI content and value.  Key/keyref
enforcement should be agnostic about where the type information which
induced the values comes from.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.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]
Received on Tuesday, 29 October 2002 09:01:23 GMT

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