Chapter 1. Overview of the ADML DTD
A backwards-incompatible change is a change to any ELEMENT or ATTLIST declaration (or any parameter entity or other construct that such a declaration references, directly or indirectly) that results in a restriction of markup choices, such that some or all model instances conforming to previous versions might not conform to the new version.
The Open Group's policy is not to make backwards-incompatible changes in minor revisions (x.n to x.n+1); such changes shall be made only in major revisions (x.n to y.0).
Some future backwards-incompatible changes are signaled in ``FUTURE USE'' comments in the DTD. The future version in which the change will take place is indicated in each comment.
NOTE: Note
Changes to parameter entities that affect the DTD's customizability--for example, changes to parameter entity names--are not restricted to major revisions. Thus, ADML customizers should review each new minor revision and may need to make changes to their customization layers.
See Chapter 3, ADML Changes Made and Planned for lists of changes made in recent and planned versions of ADML.
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