Re: List and union varieties

Michael Anderson <michael@research.canon.com.au> writes:

> Hi all,
> I was wondering if a simple type can be a list of a simple type that has
> a variety of union.  The specifications seem inconsistent.
> 
> http://www.w3.org/TR/xmlschema-1/#cos-st-restricts says
> If the variety is list:
> 2.1 The item type definition must have a variety of atomic or union ....
> 
> while http://www.w3.org/TR/xmlschema-2/#atomic-vs-list says
> [ Definition:] List datatypes are those having values each of which
> consists of a finite-length sequence of values of an atomic datatype.

The _values_ must be atomic, but that atomicity may be acquired via a
union type, provided the union's members are also atomic, if you see
what I mean.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
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Received on Friday, 2 February 2001 07:25:17 UTC