3 Backwards-incompatible changes to DocBook that are planned for V5.0:
5 - DocBook V5.0 will be an XML DTD. This will require a wide range of
6 changes. As a result, DocBook V5.0 will more closely resemble
7 The XML version of DocBook V4.1 than the SGML version.
9 - Parameter entity reorganization may greatly reduce many
10 content models. The goal of this effort is to remove a large
11 number of spurious elements that snuck into content models
12 during the first PE reorg, in practice these changes should have
13 very little "real world" impact.
15 - The Coords attribute will be removed from AreaSet.
17 - ArtHeader will be dropped from BiblioEntry
19 - Contents attribute will be removed from BookInfo and SetInfo
21 - The %indexdivcomponent.mix; will be restricted. Numbered figures
22 and other elements inappropriate for an Index or SetIndex will be
25 - RevHistory will be removed from GlossTerm
27 - Constant Class will be removed from SystemItem
29 - Graphic and InlineGraphic will be removed
31 - Tables will be restricted from full CALS to the OASIS Exchange model
33 - An experimental XML Schema version of DocBook 5.0 will be
34 produced in parallel with the DTD version. It will be
35 backwards-incompatible in an unspecified number of ways. The
36 goal of the effort will be that most DocBook documents that
37 validate under the DTD will also validate under the Schema,
38 but the committee does not feel bound to guarantee this