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