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Each version of a file has a unique revision number. Revision numbers look like ‘1.1’, ‘1.2’, ‘1.3.2.2’ or even ‘1.3.2.2.4.5’. A revision number always has an even number of period-separated decimal integers. By default revision 1.1 is the first revision of a file. Each successive revision is given a new number by increasing the rightmost number by one. The following figure displays a few revisions, with newer revisions to the right.
+-----+ +-----+ +-----+ +-----+ +-----+ ! 1.1 !----! 1.2 !----! 1.3 !----! 1.4 !----! 1.5 ! +-----+ +-----+ +-----+ +-----+ +-----+
It is also possible to end up with numbers containing more than one period, for example ‘1.3.2.2’. Such revisions represent revisions on branches (see Branching and merging); such revision numbers are explained in detail in Branches and revisions.