Re: [xml] XML Schema, unique and namespaces

[Piotr Sipika <piotreks optonline net>]

> Hi there. A few points:
>
> * Not sure this list is really an appropriate place to ask questions
>   about the W3C XML Schema Language.

Very true, but libxml2 supports (albeit incompletely) validating XML 
documents with XSD, so any questions pertaining to that are valid.

> * Why are you using it, anyway? (I generally advise against using any
>   constraint language other than DSDL (i.e., RELAX NG, ISO
>   Schematron, et al.) unless circumstances absolutely require it.)

XSDs provide a basic constraint mechanism that works very well. Beyond 
the basics (i.e. conditional restriction), yes, one should avoid using 
it.  If the design calls for XSD validation including basic occurrence 
restriction, I see no reason to shy away from it.

All the best!
Piotr