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Re: [xml-dev] a puzzling schema promise

The 'must ignore unknown (retain/discard)' pattern is oft referred to
and is certainly one I favour quite strongly (hence my assertion in
another thread that I don't value XSD highly in the context of
validation). If that's what your Basilage paper is going to talk about
then I will look forward to it (and if it isn't, ....  I'll still look
forward to it :-)


On 09/04/2013, Simon St.Laurent <simonstl@simonstl.com> wrote:
> Press releases are often a better place to find an explanation of what
> specifications are meant to do than the specifications themselves.  The
> W3C in particular has had strong press operation for a long time, and
> generally conveyed its plans for specifications pretty well.
> Based on that theory, I've been exploring the archive of schema-related
> press releases, and found this odd sentence.  The opening is just the
> usual prior agreement promise, but I'm not sure what to make of the
> conclusion:
> --------------------------------------------------
> When XML is used to exchange technical information in a multi-vendor
> environment, schemas will allow software to distinguish data governed by
> industry-standard and vendor-specific schemas, and help applications
> know when it is safe to ignore information they do not understand, and
> when they must not do so.
> --------------------------------------------------
> This sounds more... intricate than validation, but I'm guessing that's
> all it really is.  Is there something more to "when it is safe to ignore
> information they do not understand, and when they must not do so"?
> That last bit seems to expand to "must not [ignore information they do
> not understand]".  That fits quite nicely in the approach I'm describing
> - but not so much with any XML Schema application I've encountered.
> Any thoughts?
> Thanks,
> --
> Simon St.Laurent
> http://simonstl.com/
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