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Re: XML Schemas: Best Practices

• From: Martin Bryan <mtbryan@s...>
• To: "Roger L. Costello" <costello@m...>, xml-dev@l...
• Date: Wed, 17 Jan 2001 15:28:47 +0000

> It would be nice if there was a way to explicitly flag places where
> extensibility may occur: "hey, instance documents may extend <Book> at
> this point, so be sure to write your code taking this possibility into
> account

The XML Schema spec deliberately takes the opposite approach. If a complex
type should not be extended it should be flagged with final="extension" (or
final="#all" if restrictions are forbidden too). Otherwise you must presume
that the type definition can be expanded. But remember that every time it is
expanded it must be given a new name, so there is not chance of a conflict
between a reference to the original name and a reference to the expanded
name. (I don't see where substitution groups make this any differrent, as
they have to refer to a specific model/element, and these models do not have
direct inheritence properties.)

Martin Bryan
The SGML Centre

• References:
  • Re: XML Schemas: Best Practices
    • From: "Roger L. Costello" <costello@m...>
  • Re: XML Schemas: Best Practices
    • From: Eddie Robertsson <eddie@a...>
  • Re: XML Schemas: Best Practices
    • From: "Roger L. Costello" <costello@m...>
  • Re: XML Schemas: Best Practices
    • From: "Roger L. Costello" <costello@m...>
  • Re: XML Schemas: Best Practices
    • From: "Roger L. Costello" <costello@m...>
  • Re: XML Schemas: Best Practices
    • From: "Roger L. Costello" <costello@m...>

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