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James Clark wrote:
> [...] TREX provided a
> concur operator which would have been sufficient for this, but it didn't
> make it into RelaxNG, because there are major implementation issues.
What were the issues?
CONCUR is easy to implement in regular expressions over strings --
it's actually a bit simpler than INTERLEAVE -- does it get
tricky in tree-regular grammars? Or was it something else?
<URL: http://lists.oasis-open.org/archives/relax-ng/200103/msg00004.html >
only mentions type assignment and coherent error messages
as problem areas. (Personally, I'd gladly trade both for CONCUR --
you can do some neat things with it...)
--Joe English
jenglish@flightlab.com
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