[relaxng-user] Latest proposal for smart regexes in RELAX NG

[jcowan at reutershealth.com]

David.Pawson at rnib.org.uk scripsit:

> Would you put a little context around this please John?
> Or a uri where I might read about it?

The context is that it would be nice to have a better regular expression
facility than the WXS pattern facet, which uses quite limited regular
expressions, written in a messy hard-to-use code that has nothing to
do with the rest of WXS *or* RNG, and has no facility for building up
patterns from pieces of other patterns.

The design I posted is:

1) cleanly embeddable into RNG, sharing its naming conventions when possible
2) uses elements in the rx: namespace to express the components of
   regular expressions
3) allows references with rx:ref to sub-regexes defined within
   ordinary rng:define elements.
4) implementable using an ordinary Posix regex engine

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