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Re: XSD substitution groups, subtypes, nillable .. the whole

• To: Soren Kuula <dongfang@d...>
• Subject: Re: XSD substitution groups, subtypes, nillable .. the whole
• From: ht@i... (Henry S. Thompson)
• Date: Fri, 24 Feb 2006 17:31:40 +0000
• Cc: xml dev <xml-dev@l...>
• In-reply-to: <43FF4784.7070709@d...> (Soren Kuula's message of "Fri, 24 Feb 2006 17:51:00 +0000")
• References: <43FF4784.7070709@d...>
• User-agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.17 (linux)

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Thanks for clarifying -- before going further in constructing a reply,
we need to fix something:

Given

> <complexType name="a">
>   <!--- some model --->
> </complexType>
>
> <complexType name="b">
>   <extension base="a">
>      <!--- some model -->
>   </extension>
> </complexType>

then

> <element name="x" type="a" substitutionGroup="y"/>
>
> <element name="y" type="b"/>

is backwards, i.e. not allowed as written.  For x to be in the
substitution group of y, x's type must be or be derived from y's type,
but in this case it's the other way around.

Does this invalidate the rest of your questions about this example, or
should we just reverse 'a' and 'b' in this example, or . . .?

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@i...
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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