Simetrical schreef:
Any expression involving only AND and OR should be possible to express without parentheses, if AND binds more tightly than OR or vice versa.
True. Whether it's a good think to let users write "a AND c OR a AND d OR b AND c OR b AND d" rather than "(a OR b) AND (b OR d)" is another issue.
Roan Kattouw (Catrope)