numbers meaning

["Mauricio Smythe" <msmythe () inf utfsm cl>]

Hi everyone
Please what is the meaning of the numbers within the brakets in each alert
in the snort alert file? [1:407:4]

I think the middle number is the snort ID (SID), but i´m not shure because
whet the alert has no SID it also apperars.

Thanks in advance



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