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Add a formal semver 2.0.0 version type #371

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21 changes: 21 additions & 0 deletions schema/docs/versions.md
Original file line number Diff line number Diff line change
Expand Up @@ -288,6 +288,27 @@ Now that we know how to encode version objects, that would be written as:
}
]

### Version Types

#### Semantic versioning 2.0.0
Type identifier: `semver-2.0.0`
Formally specified here at https://semver.org/spec/v2.0.0.html
`semver-2.0.0` is new type introduced to formally specify usage of semantic versioning.
---
`semver-2.0.0` in its simplest form is a dot separated triple. eg `1.2.3`. The three parts have names with the first being the `MAJOR`, the second being `MINOR` and the third `PATCH`. The [Semantic](https://en.wikipedia.org/wiki/Semantics) meaning of each is described as
1. MAJOR version when you make incompatible API changes
2. MINOR version when you add functionality in a backward compatible manner
3. PATCH version when you make backward compatible bug fixes
This triple can be extended with either a `-` or a `+` or with both for `pre-release` and `build` identifiers.
The triple can only be populated with non-negative integers and must not contain leading zeros.
Ordering of the triple is determined by the first difference when comparing each of these identifiers from left to right as follows: Major, minor, and patch versions are always compared numerically.
Full ordering for pre-releases and builds are described in the semver document [here](https://semver.org/spec/v2.0.0.html#spec-item-11).
While the triple can only contain numeric values the `pre-release` and `build` are free to be alpha numeric.
A complete definition of this version type can be viewed here
https://semver.org/spec/v2.0.0.html#backusnaur-form-grammar-for-valid-semver-versions



## Version Status Changes

As presented in the previous section,
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