[dsdl-discuss] Re: STX?

MURATA Makoto wrote:

> But this is my fault. In N0836 (WG1 Recommendations) :
>
> WG1 requests that Mohamed Zergaoui contacts those involved in
> the recently proposed W3C activity relating to streaming of XML
> to determine if they would be willing to submit their work for
> standardization as Part 6 of DSDL. In anticipation of their
> acceptance it is proposed that the title of Part 6 be amended to
> read "Stream-based Integrity Constraints"
>
> So, WG1 (and thus SC34) did decide to invite STX as DSDL Part 6.
>
> However, I do not think that STX belongs to DSDL, which is a collection
> of schema languages. I am not saying STX should not be standardized at SC34.
> I am just saying that STX should be an independent specification.

Pardon me asking probably silly question. As I'm not involved in DSDL
from beginning I do not have yet precise idea of what Part 6 should
solve and I wasn't able to find some definition or set of requirements
for it.

Is it correct my understanding that it should define mechanism similar
to xs:key and xs:keyref from W3C XML Schema? If this is a case it seems
that STX is really not proper technology for it. Of course STX could be
used for such checks but then CD should specify also some output format
(e.g. something like SVRL).

But if STX is used which means that integrity constraints can't be
expressed as first class citizens and there will be just some code to
check for them, wouldn't it be Schematron sufficient then? May be not
because it can't check recursive and graph structures. But what about
extending Schematron with such facility then?

                        Jirka

P.S. And sorry for my previous email, I see that you folks already know
that STX is now being processed by W3C.

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