On Jan 6, 2005, at 11:59 AM, António Mota wrote:
Also, i had a look at Relax NG but didn't understand what it is. It
seems a alternative to Schema?
Yes. And many people believe a superior alternative. OpenOffice,
DocBook and TEI -- to name just a few high profile document schemas --
are all authored in RNG.
A replacement for DTD?
Yes.
However it's not a W3C standard, or is it?
No. IIRC, it is an ISO standard though.
I like RNG because it's easy to learn (before learning it, I didn't
even know how to write a DTD), but is more powerful (for what I do)
than XML Schema. Simple examples:
in RNG, you can condition validation on attributes; in XSD you cannot
in RNG you can validate irrespective of element order; in XSD you cannot
Both of these features are really useful.
The other thing I like about RNG is Trang, which is a tool that allows
you to convert RNG schemas to XSD or DTD (assuming you don't use
RNG-only features, of course).
Bruce
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