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Re: Creating flexible & extensible schemas (for a university E

• To: "Michael Kay" <michael.h.kay@n...>
• Subject: Re: Creating flexible & extensible schemas (for a university Event)
• From: "Allison Bloodworth" <abloodworth@b...>
• Date: Tue, 2 Nov 2004 09:01:58 -0800
• Cc: <xml-dev@l...>
• References: <20041101202328.LVCO19539.mta07-svc.ntlworld.com@Turtle>

Hi Michael,

Thanks very much for the advice. I was not entirely sure what you meant by a
meta-schema, so I looked Googled it and found this article:
http://www.xml.com/pub/a/2002/10/02/metaschema.html.
I don't think you meant that I should modify XMLSchema.xsd, but instead that
I should have an Events.xsd schema that is somehow modified to become
UCBerkeleyEvents.xsd. That is exactly what I did in the schemas I pointed to
in the first message, and I tried using redefines on one hand and
substitution groups on the other to accomplish this. Since you mention
having schemas in the same namespace, I'm guessing you're referring to a
process that involves redefines? But you also mention transformation & input
parameters, so I'm not sure...can you clarify?

Thanks,
Allison
----- Original Message ----- 
From: "Michael Kay" <michael.h.kay@n...>
To: "'Allison Bloodworth'" <abloodworth@b...>;
<xml-dev@l...>
Sent: Monday, November 01, 2004 12:22 PM
Subject: RE:  Creating flexible & extensible schemas (for a
university Event)


> > One question I'm struggling with is whether to make most of
> > the elements optional.
>
> There doesn't have to be one schema.
>
> It can be a bit tricky to manage multiple schemas for the same namespace
> (because there are parts of the spec that seem to assume that by
specifying
> the namespace, you have identified the schema), but it's definitely part
of
> the design thinking that the validation rules you want to impose might be
> stricter in some circumstances, weaker in others.
>
> The right solution here might be a meta-schema that can be transformed
> (using a set of input parameters) into the target schema you actually use
> for validation. For example, this allows the list of enumeration values to
> be varied.
>
> Michael Kay
> http://www.saxonica.com/
>
>
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• References:
  • RE: Creating flexible & extensible schemas (for a university Event)
    • From: "Michael Kay" <michael.h.kay@n...>

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