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Preface

Preface = ( PrefaceInfo?,
            (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 : Preface, PrefaceInfo, Title, Subtitle, TitleAbbrev, ToC, LoT, Index, Glossary, Bibliography, ToCchap, Sect1, RefEntry, SimpleSect, Section.