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Re: [RESEND] Derivation by restriction

From: Jeni Tennison <jeni@jenitennison.com>
Date: Sat, 16 Mar 2002 11:21:52 +0000
Message-ID: <23270256277.20020316112152@jenitennison.com>
To: "Dare Obasanjo" <dareo@microsoft.com>
CC: "Xmlschema-Dev (E-mail)" <xmlschema-dev@w3.org>
Hi Dare,

> NOTE: The above constraint on {type definition}
> <http://www.w3.org/TR/xmlschema-1/#type_definition> means that in
> deriving a type by restriction, any contained type definitions must
> themselves be explicitly derived by restriction from the
> corresponding type definitions in the base definition.
>
> However this runs contrary to both the text in 'Essential XML Quick
> Reference' on XML Schema xs:restriction (p. 337) and the example in
> the XML Schema Primer[1] which imply that simply defining the
> contained type again in a derived type without the contained type
> deriving by restriction is allowable. XML Spy also validates both
> schemas.
>
> So are we interpreting the recommendation correctly or not?  

For what it's worth, I think that you are, and that the Primer is in
error.

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/
Received on Saturday, 16 March 2002 06:22:00 GMT

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