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Major revisions of S1000D are indicated by change of the first position of the issue
number; for example, change from issue 3.0 to 4.0. A major revision is not backward
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Minor revisions are indicated by change of the second position of the issue number;
for example, change from issue 2.0 to 2.1. A minor revision is backward compatible
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Patches are indicated by addition of a letter in the third position of the issue
number; for example issue 4.1.A. This indicates a release of minor corrections and
bug fixes. No new technical functionality is introduced with patches. Patch releases
are included in the download package of the major/minor issue to which they apply.
Note: Prior to issue 4.1, patches were indicated by a number in the third position.