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   Re: [xml-dev] [xsd] Schema in multiple documents

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Hello Chizzolini,

I'm trying to use XML Schema(XSD) too.

There are many ways to define a schema with XSD.
the following URL is the article about 'how to avoid the pitfalls'.


That maybe help you.

And also, there are many practical XSDs.
As I know, it seems the best practice is as following sample.

(download zip file, then extract
 and find root xsd file in 'XML/Interchange' directory)

That is the standarized xml based message schema about 
notifing of Semiconductor Test Data. That design is 'Modular based'.
I think that is a good sample for designing XSD.


Masaaki KOGA

On Wed, 15 Dec 2004 12:50:06 +0100
Chizzolini Stefano <chist@csb.it> wrote:

> Hi all
> I'm defining a schema (via XML Schema) stretched over multiple documents,
> but I feel quite unsure about the best strategy to reference its definitions
> each other across the file boundaries.
> What I need is a clean method to enable the reuse of components.
> As I know, there are mainly two constructs from the XSD namespace for this
> purpose:
> - include element: same target namespace as the including document;
> - import element: any target namespace.
> (I chose the include element as it seems to fit my case).
> My headache comes when I try to establish WHICH document references WHAT
> For example (the target namespace is the same for all the documents):
> - document A contains common types (it could be considered the main document
> for the target namespace);
> - document B contains derived types;
> - document C contains other basic (non-derived) types;
> - documents FF are future extensions of the target namespace.
> Document A should be reused by B and FF.
> Should I:
> - include A inside B and FF, whilst C inside A? This way all the common
> components are centrally referenced by A, while any extension document (B or
> FF) has just to care about referencing the main document (A). This should
> improve the referential consistency and smooth expandability, but forces any
> instance document to reference the location of a specific "leaf" schema
> document (I say, B or FF) as the main document (A) isn't aware about any
> extension document (it has just references to basic component documents like
> C)!
> - include A inside B and FF, whilst B and FF and C inside A? This way any
> instance document could reference just the main document (A) and use all the
> derived types at a time, but the references across the schema documents
> would be multiplied and would cause circular references (is it legal? may it
> affect the validator performance?). As another side effect, the main
> document should be updated any time an extension document is created.
> Which solution do you think that's better?
> Is there another (better) approach?
> Thanks for the tips!
> Stefano
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