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Chapter

Chapter = ( ChapterInfo?,
            ( Title, Subtitle?, TitleAbbrev? ),
            ( ToC | LoT | Index | Glossary | Bibliography )*,
            ToCchap?,

            ( ( (%divcomponent.mix;)+,
                ( Sect1* | RefEntry* | SimpleSect* | Section*)
              ) |
              ( Sect1+ | RefEntry+ | SimpleSect+ | Section+ )
            ),

            ( ToC | LoT | Index | Glossary | Bibliography )*)

Elements : Chapter, ChapterInfo, Title, Subtitle, TitleAbbrev, ToC, LoT, Index, Glossary, Bibliography, ToCchap, Sect1, RefEntry, SimpleSect, Section.