Why is this a bad thing? It's not particularly harmful - it just gets
re-validated again. I had assumed you only meant double-posting a
_successful_ form which of course is undesirable.
With your example, you are allowing to do re-submit. If someone
fills the form and submit, he'll see the same page again because the
'enquiryAction' is responsible of two things: show the form and
validate the form. If the form validation goes wrong, the user can
hit the reload button (CTRL+R in firefox) and can see the nasty
popup window alerting about double submit. This is one thing i don't
want to show, ever.
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