'\"
'\" Generated from file 'docidx_lang_syntax\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2007-2009 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>
'\"
.TH "docidx_lang_syntax" n 1\&.0 tcllib "Documentation tools"
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.SH NAME
docidx_lang_syntax \- docidx language syntax
.SH DESCRIPTION
.PP
This document contains the formal specification of the syntax of the
docidx markup language, version 1 in Backus-Naur-Form\&. This document
is intended to be a reference, complementing the
\fIdocidx language command reference\fR\&.
A beginner should read the much more informally written
\fIdocidx language introduction\fR first before trying to
understand either this document or the command reference\&.
.SH FUNDAMENTALS
In the broadest terms possible the \fIdocidx markup language\fR 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\&.
.PP
Each markup command is a just Tcl command surrounded by a matching
pair of \fB[\fR and \fB]\fR\&. Which commands are available,
and their arguments, i\&.e\&. syntax is specified in the
\fIdocidx language command reference\fR\&.
.PP
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\&.
.SH "LEXICAL DEFINITIONS"
In the syntax rules listed in the next section
.IP [1]
<TEXT> stands for all text except markup commands\&.
.IP [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 \fB[\fR and \fB]\fR\&. Inside of these
delimiters the usual rules for a Tcl command apply with regard to word
quotation, nested commands, continuation lines, etc\&.
.IP [3]
<WHITE> stands for all text consisting only of spaces, newlines,
tabulators and the \fBcomment\fR markup command\&.
.PP
.SH SYNTAX
The rules listed here specify only the syntax of docidx documents\&. The
lexical level of the language was covered in the previous section\&.
.PP
Regarding the syntax of the (E)BNF itself
.IP [1]
The construct { X } stands for zero or more occurrences of X\&.
.IP [2]
The construct [ X ] stands for zero or one occurrence of X\&.
.PP
The syntax:
.CS


index     = defs
            INDEX_BEGIN
            [ contents ]
            INDEX_END
            { <WHITE> }

defs      = { INCLUDE | VSET | <WHITE> }
contents  = keyword { keyword }

keyword   = defs KEY ref { ref }
ref       = MANPAGE | URL | defs

.CE
At last a rule we were unable to capture in the EBNF syntax, as it is
about the arguments of the markup commands, something which is not
modeled here\&.
.IP [1]
The arguments of all markup commands have to be plain text, and/or text
markup commands, i\&.e\&. one of
.RS
.IP [1]
\fBlb\fR,
.IP [2]
\fBrb\fR, or
.IP [3]
\fBvset\fR (1-argument form)\&.
.RE
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIdoctools\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH "SEE ALSO"
docidx_intro, docidx_lang_cmdref, docidx_lang_faq, docidx_lang_intro
.SH KEYWORDS
docidx commands, docidx language, docidx markup, docidx syntax, markup, semantic markup
.SH CATEGORY
Documentation tools
.SH COPYRIGHT
.nf
Copyright (c) 2007-2009 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>

.fi
