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   Re: [xml-dev] dynamically extensible schema

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This is kludgy, and there may be a better way to do it (if so, someone
will suggest it shortly I am sure).

(1) Declare type XY as an abstract type, in the "extended" namespace

(2) Use the xsd:any wildcard element, as you suggest below

(3) With the xsd:any element, specify a "namespace" attribute of the
"extended" namespace identifier - Ex:

<any namespace="extended_namespace_identifier_goes_here"
...rest of declaration.../>

I also don't believe that your namespace identifiers of "core" and
"extended" are valid URIs, as required.

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton

Christian Sell wrote:
> Hello,
> I have a question I am banging my head against. I am looking for a way
> to validate instances like the following:
> <?xml version="1.0" encoding="UTF-8"?>
> <dtw xmlns="core" xmlns:ext="extended">
>      <echo message="this is a message"/>
>      <ext:echo/>
> </dtw>
> The special thing is that the potential number of namespaces/schemas
> appearing in instances (beyond the core schema) is undetermined, and I
> therefore do not want to include a reference to the "extended" schema(s)
> inside the "core" schema. Instead, I would like to have a definition in
> the core schema that says something like:
> "after the echo element, let there follow any number of elements from
> any namespace whose type extends the type XY" (where XY would also be
> defined in the core schema).
> The only meachnism that I found in XML schema that comes close is the
> xsd:any element, but that does not alow me to specify the derivation
> constraint I mentioned above.
> Does anyone have a hint?
> thanks,
> Christian
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tel;work:(703) 902-6923
org:Booz | Allen | Hamilton;IT Digital Strategies Team
adr:;;8283 Greensboro Drive;McLean;VA;22012;
title:Senior Consultant
fn:Joseph M. Chiusano


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