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+19 June 2000
+
+Backwards-incompatible changes to DocBook that are planned for V5.0:
+
+- DocBook V5.0 will be an XML DTD. This will require a wide range of
+ changes. As a result, DocBook V5.0 will more closely resemble
+ The XML version of DocBook V4.1 than the SGML version.
+
+- Parameter entity reorganization may greatly reduce many
+ content models. The goal of this effort is to remove a large
+ number of spurious elements that snuck into content models
+ during the first PE reorg, in practice these changes should have
+ very little "real world" impact.
+
+- The Coords attribute will be removed from AreaSet.
+
+- ArtHeader will be dropped from BiblioEntry
+
+- Contents attribute will be removed from BookInfo and SetInfo
+
+- The %indexdivcomponent.mix; will be restricted. Numbered figures
+ and other elements inappropriate for an Index or SetIndex will be
+ removed.
+
+- RevHistory will be removed from GlossTerm
+
+- Constant Class will be removed from SystemItem
+
+- Graphic and InlineGraphic will be removed
+
+- Tables will be restricted from full CALS to the OASIS Exchange model
+
+- An experimental XML Schema version of DocBook 5.0 will be
+ produced in parallel with the DTD version. It will be
+ backwards-incompatible in an unspecified number of ways. The
+ goal of the effort will be that most DocBook documents that
+ validate under the DTD will also validate under the Schema,
+ but the committee does not feel bound to guarantee this
+ condition.