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VERSION_NUMBERING
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VERSION_NUMBERING
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This file has been dedicated to the public domain, to the extent
possible under applicable law, via CC0. See
http://creativecommons.org/publicdomain/zero/1.0/ for more
information. This file is offered as-is, without any warranty.
========================================================================
This is an explanation of the SGE's version numbering, in particular how
it indicates compatibility between various SGE releases.
The SGE specification has only two components to its version number: the
major version, and the minor version.
Two versions of the SGE specification with different major version
numbers can be expected to be incompatible. For example, there is no
guarantee that a program designed for version 1.0 of the SGE will work
with version 2.0 of the SGE.
A version of the SGE specification with the same major version number,
but a higher minor version number, than another version of the SGE
specification can be assumed to be backward-compatible. This number is
used to indicate things like unintrusive feature additions. For
example, it can be expected that a program designed for version 1.0 of
the SGE will work with version 1.1 of the SGE.
As a special exception, two versions of the SGE with the major version
number 0, but a different minor version number, can be expected to be
incompatible (i.e. the minor version number is treated as the major
version number). The major version number 0 is to be used until the
specification has been properly tested (by developing a full,
non-trivial game with it), so that it can be sure that version 1.0 of
the specification is reasonably complete.
SGE implementations, like the Pygame SGE, have either two or three
components to their version numbers. The first two components should
match the specification version they are implementing; for example,
version 0.12 of the Pygame SGE implements version 0.12 of the SGE
specification.
The optional third component should be used to indicate any
implementation-specific changes, such as bugfixes.