doctoc_lang_syntax - doctoc language syntax

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       Copyright (c) 2007-2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>

tcllib                                                 1.0                              doctoc_lang_syntax(3tcl)

       This  document contains the formal specification of the syntax of the doctoc markup language, version 1.1
       in Backus-Naur-Form. This document is intended to be  a  reference,  complementing  the  doctoclanguagecommandreference.  A beginner should read the much more informally written doctoclanguageintroduction
       first before trying to understand either this document or the command reference.

       In the broadest terms possible the doctocmarkuplanguage is like SGML and similar languages. A  document
       written  in  this  language  consists  primarily  of  markup commands, with text embedded into it at some
       places.

       Each markup command is a just Tcl command surrounded by a matching pair of [ and ].  Which  commands  are
       available, and their arguments, i.e. syntax is specified in the doctoclanguagecommandreference.

       In  this  document  we specify first the lexeme, and then the syntax, i.e. how we can mix text and markup
       commands with each other.

       doctoc commands, doctoc language, doctoc markup, doctoc syntax, markup, semantic markup

       In the syntax rules listed in the next section

       [1]    <TEXT> stands for all text except markup commands.

       [2]    Any XXX stands for the markup command [xxx] including its arguments. Each markup command is a  Tcl
              command surrounded by a matching pair of [ and ]. Inside of these delimiters the usual rules for a
              Tcl command apply with regard to word quotation, nested commands, continuation lines, etc.

       [3]    <WHITE> stands for all text consisting only of spaces, newlines, tabulators and the comment markup
              command.

       doctoc_lang_syntax - doctoc language syntax

       doctoc_intro, doctoc_lang_cmdref, doctoc_lang_faq, doctoc_lang_intro

       The  rules listed here specify only the syntax of doctoc documents. The lexical level of the language was
       covered in the previous section.

       Regarding the syntax of the (E)BNF itself

       [1]    The construct { X } stands for zero or more occurrences of X.

       [2]    The construct [ X ] stands for zero or one occurrence of X.

       The syntax:

              toc       = defs
                          TOC_BEGIN
                          contents
                          TOC_END
                          { <WHITE> }

              defs      = { INCLUDE | VSET | <WHITE> }
              contents  = { defs entry } [ defs ]

              entry     = ITEM | division

              division  = DIVISION_START
                          contents
                          DIVISION_END