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RE: Creating library schemas which only expose a single document element

From: Michael Kay <mike@saxonica.com>
Date: Mon, 23 May 2005 09:17:32 +0100
To: "'Fraser Crichton'" <fraser.crichton@solnetsolutions.co.nz>, <xmlschema-dev@w3.org>
Message-ID: <E1Da887-0008J8-Qq@maggie.w3.org>
When you eventually come to write schema-aware queries or stylesheets,
you'll find that it's a good idea to make most of your elements global.
I would be inclined not to distort the schema design for this purpose. Find
some other way of checking that the top-level element in the instance
document is the one you want it to be.
Michael Kay


From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On
Behalf Of Fraser Crichton
Sent: 23 May 2005 03:17
To: xmlschema-dev@w3.org
Subject: Creating library schemas which only expose a single document


This kind of a follow up to something I posted to XML-DEV -Validating
against the correct root element using library schemas
http://lists.xml.org/archives/xml-dev/200505/msg00263.html (BTW thanks,
Michael and Henry, for getting back to me).

If I'm creating a set of library schemas where I want to enforce that
particular document / message schemas are valid and that no fragments of
documents are valid  it seems I have two approaches  - 

1) I adopt a strict venetian blind approach i.e. there are no global element
declarations in my library schemas and only a Russian doll approach in my
message / document schemas to enforce that there is only one valid root
element (however that way I can't create any reusable elements just reusable

2) I use xsd:group to hide my global elements but get reuse from them by
referencing the groups.

I have a some questions -

Would the xsd:group approach just be a dirty hack? 

Is there any reason why OASIS have not adopted xsd:group (sorry to keep
banging on about OASIS but the New Zealand government are looking at a
number of their standards ;-) )?



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Received on Monday, 23 May 2005 08:17:47 UTC

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