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Re: What comes first, the schema or the document

From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 14 Jul 2008 08:41:41 +0200
To: xmlschema-dev@w3.org
Cc: "'Lyallex'" <lyallex@gmail.com>, Michael Kay <mike@saxonica.com>
Message-ID: <20080714064141.GA9267@karelia>


Michael Kay <mike@saxonica.com> writes:

> I think it's very common for people to start with a sample instance and then
> create a schema for it. In fact, the sample instance is often a better way
> of communicating the structure than the schema itself.

That only works for fairly simple vocabularies. As soon as you start having
choices, optional/sequence elements/attributes, the number of separate
instances required to "show" the vocabulary becomes unmanageable. Plus this
approach has a negative side effect of people stopping to care how their
schemas look since nobody is supposed to look inside.

I think for any non-trivial vocabulary it is better to start with a clean
and readable schema right away and maybe have one or two sample instance
documents that showcase the most common scenarios.


Boris Kolpackov, Code Synthesis Tools   http://codesynthesis.com/~boris/blog
Open source XML data binding for C++:   http://codesynthesis.com/products/xsd
Mobile/embedded validating XML parsing: http://codesynthesis.com/products/xsde
Received on Monday, 14 July 2008 06:46:44 UTC

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