Thomas Schraitle wrote:

Furthermore, what's the purpose of file "docbook.nvdl"?

That's the "Namespace-based Validation Dispatching Language", see [1].
With the help of this file and a respective validator that supports NVDL,
you can validate XML documents that are composed of different
Schemas *without* customizing the original one.

A good explanation can be found here [2].

Tom

---- References
[1] http://www.nvdl.org/
[2] http://jnvdl.sourceforge.net/about-nvdl.html

I think you may consider using Schematron if your extensions were being 'broken' by users and wanted to check them?

I've done a small write-up on nvdl too.

http://www.dpawson.co.uk/nvdl/

regards

--
Dave Pawson
XSLT, XSL-FO and Docbook FAQ
http://www.dpawson.co.uk


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