Another referendum ( or 2 )

I see that our government are preparing tenders for our referenda which will potentially include one on this proposed European treaty.
There is a huge problem though and it is this: there is no point in voting in Irish referenda as if the government of the day do not like the publics decision they simply hold the referendum again. This was done for nice and again for Lisbon. Note that when the decision went the governments etway, there was no decider.
So unless there is legislation put in place to prevent a second referendum on the same or similar subject matter, within a minimum of 5 years, and I would prefer 10, there is no point in voting in these referenda. It's a forgone conclusion.