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+6 January 1997
+
+Backwards-incompatible changes to DocBook that are planned for V4.0:
+
+- The DocInfo element will be split out into ChapterInfo, AppendixInfo,
+  etc.  ArtHeader will be renamed to ArticleInfo.  SeriesInfo may be
+  discarded because it has become a special case of BiblioSet.
+  BookBiblio will be discarded in favor of a new, more inclusive,
+  structure for BookInfo (and for ArticleInfo, whose earlier ArtHeader
+  form contained BookBiblio).
+
+- The %article.class; entity may be removed from the Book content model,
+  and made part of a new top-level document hierarchy.
+
+- The %nav.class; entity, which appears in several divisions, will allow
+  ToCchap instead of ToC.
+
+- MsgText will be moved from tech.char.class to a more appropriate
+  parameter entity.
+
+- The following elements will have their content constrained to the
+  %smallcptr.char.mix; mixture: Action, Command, Database, Filename,
+  Hardware, Interface, KeyCap, Literal, Option, Parameter, Property, and
+  SystemItem.
+
+- AuthorBlurb and Affiliation will be removed from %person.ident.mix;
+  and a new wrapper element created to allow association of those two
+  elements with Author name information.
+
+- Epigraph will be disallowed from appearing in BlockQuote.
+
+- Comment will be renamed to Remark and will be excluded from itself.
+
+- GlossTerm will be excluded from itself, and may be split into an
+  element that appears in a Glossary and an element that can appear in
+  the main text.
+
+- The Subject attribute on GlossDef will be renamed Keyword.
+
+- Two SegTitle elements will be required in SegmentedList.
+
+- Graphic and InlineGraphic will be declared EMPTY.  This change will
+  require that end-tags be removed and that any embedded graphic content
+  be stored outside the SGML source and pointed to from an Entityref or
+  Fileref attribute.
+
+- The OptMult and ReqMult values for the Choice attribute on Group
+  will be removed.  Use the Rep attribute instead to indicate that the
+  choice is repeatable.
+
+- The content model group inside FuncSynopsis starting with FuncDef
+  will not be available; you will have to use FuncPrototype.  Also, you
+  will be able to have a mixture of FuncPrototypes and FuncSynopsisInfos
+  (this is not backwards-incompatible all by itself).
+
+- The EnvironVar and Prompt values for the Class attribute on SystemItem
+  will be eliminated; use the EnVar and Prompt elements instead.
+
+- All link elements will be excluded from themselves and each other.