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Re: block, blockDefault

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: Tue, 26 Aug 2003 09:48:44 +0100
To: "Alain Andrieux" <aa_vrac@hotmail.com>
Cc: xmlschema-dev@w3.org
Message-ID: <f5blltg7qj7.fsf@erasmus.inf.ed.ac.uk>

"Alain Andrieux" <aa_vrac@hotmail.com> writes:

>> > Can I use the derived type as the type of an element which is a
>> > restriction of an element defined in a base type derived by
>> > restriction?

>> Sorry, I can't make sense of this -- you can use any type _you_ define
>> legally as the type defn of any of your own elements, or as the base
>> for other types you define.  All you can't do is use them where the
>> original base type (with the 'block' attribute' was expected.
>
> What I have in mind is, using a very simplified declaration:
>
> in schema A:
>
> <schema targetNamespace="nsA" blockDefault="#all" [...] //note the
> blockDefault here
> <complexType name="Customer">
>      <sequence>
>           <element name="address" type="Address"
>      </sequence>
> </complexType>
>
> <complexType name="Address">
>     [...]
> </complexType>
>
> </schema>
>
> in schema B, importing schema A:
>
> <schema targetNamespace="nsB"
> <import [...] location=schemaB/>
> <complexType name="MyCustomer">
>      <restriction base="nsA:Customer">
>          <sequence>
>              <element name="address" type="MyAddress"  //type restriction
>          </sequence>
>     </restriction>
> </complexType>
>
> <complexType name="MyAddress">
>     <restriction base="nsA:Address">
>       [...]
>     <restriction>
> </complexType>
> </schema>

Sure, those are fine schema docs, and instances _in nsB_ can use them
w/o conflict with the block.  What you _can't_ do is

 <nsA:address xsi:type=nsB:MyAddress> . . .

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                      Half-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/
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Received on Tuesday, 26 August 2003 04:48:46 GMT

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