1> Software using Semantic Versioning must declare a public API. This API could be declared in the code itself or exist strictly in documentation. However it is done, it should be precise and comprehensive.
2> A version number takes the form X.Y.Z where X, Y, and Z are integers. X is the major version, Y is the minor version, and Z is the patch version. Each element increases numerically such that version 1.0.10 follows 1.0.9.
3> When tagging releases in a version control system, the tag for a version MUST be "vX.Y.Z" e.g. "v3.1.0".
4> Once a versioned package has been released, the contents of that version MUST never be modified. Any modifications MUST be released as a new version.
5> Major version zero (0.y.z) is for initial development. Anything may change at any time. The public API should not be considered stable.
6> Version 1.0.0 defines the public API. The way in which the version number is incremented is now dependent on this public API and how it changes.
7> Patch version Z (x.y.Z x > 0) MUST be incremented if only backwards compatible bug fixes are introduced. A bug fix is defined as an internal change that fixes incorrect behavior.
8> Minor version Y (x.Y.z x > 0) MUST be incremented if new, backwards compatible functionality is introduced to the public API. It MAY be incremented if substantial new functionality or improvements are introduced within the private code. It MAY include patch level changes.
9> Major version X (X.y.z X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API. It MAY include minor and patch level changes.