S>4.Major version zero (0.y.z) is for initial development. Anything may change at any time. The public API should not be considered stable.

S>5.Version 1.0.0 defines the public API. The way in which the version number is incremented after this release is dependent on this public API and how it changes.

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FAQ

>>How should I deal with revisions in the 0.y.z initial development phase?

S>The simplest thing to do is start your initial development release at 0.1.0 and then increment the minor version for each subsequent release.

>>How do I know when to release 1.0.0?

S>If your software is being used in production, it should probably already be 1.0.0. If you have a stable API on which users have come to depend, you should be 1.0.0. If you're worrying a lot about backwards compatibility, you should probably already be 1.0.0.