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   Re: 25 Feb Structures Questions

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  • From: Michael Anderson <michael@research.canon.com.au>
  • To: "Henry S. Thompson" <ht@cogsci.ed.ac.uk>
  • Date: Fri, 10 Mar 2000 09:13:10 +1100

"Henry S. Thompson" wrote:

>  Michael Anderson <michael@research.canon.com.au> writes:
>  > 2. Also with restrictions, if attributes of elements are omitted do they
>  > default to the standard default or the values defined in the base type
>  > definition?  Or is it an error to omit attributes previously defined in
>  > the base?
>  Do you mean if they are omitted in instances?  If the derived type
>  definition has defaults, they will get used.

I mean in the Schema document.  So for example, based on the Primer example:
(take note of the attribute minOccurs)

<complexType name="World-Address" >
  <element name =  "name"   minOccurs ="0" maxOccurs="*" />

<complexType name="US-Address"  base="ipo:World-Address" derivedBy="restriction"
  <element name = "name"  type="string" />

What now is the value of minOccurs for the "name" element in the type
"US-Address"?  Is it 0 as that was defined in the base type, or is it 1 which is
defined as the default for elements (section 4.4.2 of Part 1:Structures)?
0 or 1?

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