> <example
>   count = integer
>   size = (large | medium | small) : medium>
>   Content: (all | any*)
> </example>
> 
> Any pointers much appreciated. Is it OK to use it for non-W3C 
> specifications?


There are a number of similar notations, for example a similar notation is
used in XSLT: the specification of the notation is fairly informal.

>Is it OK to use it?

Why on earth not? (Unless you want to do a patent search, of course...)

Václav Trojan has developed a language and tool called Xdefinition which
formalizes and extends this approach, and which deserves to be much better
known. He has described it in conference papers at XML Prague. Further
information at

http://www.syntea.cz/xdweb/userdoc/XMLPrague2009_en.pdf

Michael Kay
Saxonica


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