alternatives ::= equiAlt +/ (ws ">" ws)
equiAlt ::= conjuncts +/ (ws "|" ws)
-sequence ::= e */ (w**)
- > e */ (w**) ws ^"/" e
-
-ss ::= es => "seq" | es ^"/" e /ws
-
conjuncts ::= rewrite
| rewrite ^"&" e*/ws /ws
| rewrite ^"&~" e*/ws /ws
+sequence ::= e*/ws (ws "/" e)? => "seq"
+
rewrite ::= sequence /ws => "rewrite"
| sequence ^"=>" (word|quoted) /ws