Eric van der Vlist wrote:
>
> Schematron is the only language I know where "everything which is not
> forbidden is allowed", the main principle of the other languages being
> rather that "everything which is not allowed is forbidden" which, by
> itself, is "closed".
This is what I meant by assertion-based, but probably I was not clear.
I wrote:
> But I have always wondered why Rick Jelliffe opposes to other languages.
> What he calls "closed" is not a hangover from DBMS. Does he really think
> DocBook and TEI are such hangovers? "Closed" content models are sometimes
> (or often) required.
This is my main point. I think that lack of closedness is also a disadvantage.
For example, I am not aware of any data binding tools for Schematron. I do not
think it is easy to develop them, since Schematron does not provide closed content
models.
Cheers,
Makoto
