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Re: different attribute value sets for the same element ref?

From: Jeni Tennison <jeni@jenitennison.com>
Date: Tue, 15 Apr 2003 10:18:38 +0100
Message-ID: <106523153194.20030415101838@jenitennison.com>
To: "Giles Hogben" <giles.hogben@jrc.it>
CC: xmlschema-dev@w3.org

Hi Giles,

> The point is that I need to use the category element many times in
> my schema (say 50), each time with a different allowable set of
> values for name. The solution you give below does not allow reuse of
> the category element + name attribute definition (does it?).

In XML Schema, each declaration specifies the name and the type
(content/value) of the element or attribute. You cannot say "I want
to reuse this declaration but with this different type". Each time you
want to have an element or attribute with a different name or type you
have to have a different declaration for it. Those declarations can be
local (declared within the complex type of a particular element) in
order to prevent name clashes.

I'm not sure what information about the category element or name
attribute you want to reuse, but it might be that you can get reuse by
deriving the type of each of your fifty category elements from the
same type.

Or it might be that you could assign a union type to the name
attribute to represent the choices between sets of enumerated values,
but the schema would not then check whether a particular category
element had one of a particular set of values for its name attribute.



Jeni Tennison
Received on Tuesday, 15 April 2003 05:18:47 UTC

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