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

[David Tolpin]

>
> 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
>

What would be the compact syntax for rx:?