The latest version of the grammar file is kept at
is currently a "first draft". It differs somewhat from rx_grammar.pl,
in that it incorporates some of the rule syntax changes that
don't yet appear in S05/A05. (I hope to be bringing S05/A05
more up to date soon, patches are welcome!)
Some constructs needed to fully describe the rules syntax aren't
available in PGE yet; in these cases I've provided a rule as it
should probably look, followed by whatever version of the rule
PGE can currently support.
Also, I know there are some rule syntaxes that are missing in this
first draft, but following "release early/often" I thought I'd
go ahead and publish a somewhat incomplete version for now.
All patches and feedback are greatly appreciated.