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4.1 Revision numbers

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. 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 section 5 Branching and merging); these revision numbers are explained in detail in section 5.4 Branches and revisions.