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Re: XML Schema datatypes: NaN, lists of union types, [NEL],miscella neous editorial
- From: firstname.lastname@example.org (Henry S. Thompson)
- To: "Arnold, Curt" <Curt.Arnold@hyprotech.com>
- Date: Thu, 05 Apr 2001 15:31:22 +0100
"Arnold, Curt" <Curt.Arnold@hyprotech.com> writes:
> 2. Barring lists of union types
> Section 220.127.116.11 repeatedly defines list datatypes as lists of atomic
> datatypes (as opposed to union datatypes or list datatypes).
> Section 18.104.22.168 explicitly allows union datatypes to have members
> that are either atomic or list datatypes. I assume that union
> datatypes are excluded from lists to prevent indirectly allowing
> lists of lists.
> I would suggest that the value of allowing lists of union types is
> substantially greater than allowing unions that include list types.
> Unions of union types would also be significantly valuable.
This is a misunderstanding on your part -- the section referred to is
talking about the _value space_ of lists. In the discussion of list
type definition, it is clear, e.g. at , that the 'itemType' of a
<list> may be union type definition.
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2001, part-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
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