alternatives ::= equiAlt +/ (ws ">" ws)
equiAlt ::= conjuncts +/ (ws "|" ws)
-sequence ::= es
+sequence ::= e */ (w**)
> es ws ^"/" e
es ::= e */ (w**)
| rewrite ^"&" e*/ws /ws
| rewrite ^"&~" e*/ws /ws
-rewrite ::= sequence /ws => "rewrite"
+rewrite ::= sequence /ws => "rewrite"
| sequence ^"=>" (word|quoted) /ws
ec ::= [~\-\]\\\~]