export back-ends: Remove duplicate information

* lisp/ox-ascii.el: Remove comments at the beginning of the file since
  the library is documented in Org manual.
* lisp/ox-beamer.el: Remove comments at the beginning of the file since
  the library is documented in Org manual.
* lisp/ox-html.el: Remove comments at the beginning of the file since
  the library is documented in Org manual.
* lisp/ox-icalendar.el: Remove comments at the beginning of the file since
  the library is documented in Org manual.
* lisp/ox-md.el: Remove comments at the beginning of the file since
  the library is documented in Org manual.

lisp/ox-ascii.el

@@ -21,19 +21,7 @@
 ;;; Commentary:
 ;;
 ;; This library implements an ASCII back-end for Org generic exporter.
-;;
-;; It provides two commands for export, depending on the desired
-;; output: `org-ascii-export-as-ascii' (temporary buffer) and
-;; `org-ascii-export-to-ascii' ("txt" file).  Also, three publishing
-;; functions are available: `org-ascii-publish-to-ascii',
-;; `org-ascii-publish-to-latin1' and `org-ascii-publish-to-utf8'.
-;;
-;; Output encoding is specified through `org-ascii-charset' variable,
-;; among `ascii', `latin1' and `utf-8' symbols.
-;;
-;; By default, horizontal rules span over the full text with, but with
-;; a given width attribute (set though #+ATTR_ASCII: :width <num>)
-;; they can be shortened and centered.
+;; See Org manual for more information.
 
 ;;; Code:
 

lisp/ox-beamer.el

@@ -23,93 +23,7 @@
 ;;
 ;; This library implements both a Beamer back-end, derived from the
 ;; LaTeX one and a minor mode easing structure edition of the
-;; document.
-;;
-;; Depending on the desired output format, three commands are provided
-;; for export: `org-beamer-export-as-latex' (temporary buffer),
-;; `org-beamer-export-to-latex' ("tex" file) and
-;; `org-beamer-export-to-pdf' ("pdf" file).
-;;
-;; This back-end supports every buffer keyword, attribute and options
-;; items (see `org-latex-options-alist') already supported by `latex'
-;; back-end.  As such, it is suggested to add an entry in
-;; `org-latex-classes' variable which is appropriate for Beamer
-;; export.
-;;
-;; On top of this, the `beamer' back-end also introduces the following
-;; keywords: "BEAMER_THEME", "BEAMER_COLOR_THEME",
-;; "BEAMER_FONT_THEME", "BEAMER_INNER_THEME", "BEAMER_OUTER_THEME" and
-;; "BEAMER_HEADER".  All but the latter accept options in square
-;; brackets.
-;;
-;; Moreover, headlines now fall into three categories: sectioning
-;; elements, frames and blocks.
-;;
-;; - Headlines become frames when their level is equal to
-;;   `org-beamer-frame-level' (or "H" value in the OPTIONS line).
-;;   Though, if a headline in the current tree has a "BEAMER_env"
-;;   (see below) property set to either "frame" or "fullframe", its
-;;   level overrides the variable.  A "fullframe" is a frame with an
-;;   empty (ignored) title.
-;;
-;; - All frames' children become block environments.  Special block
-;;   types can be enforced by setting headline's "BEAMER_env" property
-;;   to an appropriate value (see `org-beamer-environments-default'
-;;   for supported value and `org-beamer-environments-extra' for
-;;   adding more).
-;;
-;; - As a special case, if the "BEAMER_env" property is set to either
-;;   "appendix", "note", "noteNH" or "againframe", the headline will
-;;   become, respectively, an appendix, a note (within frame or
-;;   between frame, depending on its level), a note with its title
-;;   ignored or an againframe command.  In the latter case,
-;;   a "BEAMER_ref" property is mandatory in order to refer to the
-;;   frame being resumed, and contents are ignored.
-;;
-;;   Also, a headline with an "ignoreheading" environment will have
-;;   its contents only inserted in the output.  This special value is
-;;   useful to have data between frames, or to properly close
-;;   a "column" environment.
-;;
-;; Along with "BEAMER_env", headlines also support the "BEAMER_act"
-;; and "BEAMER_opt" properties.  The former is translated as an
-;; overlay/action specification (or a default overlay specification
-;; when enclosed within square brackets) whereas the latter specifies
-;; options for the current frame ("fragile" option is added
-;; automatically, though).
-;;
-;; Moreover, headlines handle the "BEAMER_col" property.  Its value
-;; should be a decimal number representing the width of the column as
-;; a fraction of the total text width.  If the headline has no
-;; specific environment, its title will be ignored and its contents
-;; will fill the column created.  Otherwise, the block will fill the
-;; whole column and the title will be preserved.  Two contiguous
-;; headlines with a non-nil "BEAMER_col" value share the same
-;; "columns" LaTeX environment.  It will end before the next headline
-;; without such a property.  This environment is generated
-;; automatically.  Although, it can also be explicitly created, with
-;; a special "columns" value for "BEAMER_env" property (if it needs to
-;; be set up with some specific options, for example).
-;;
-;; Every plain list has support for `:environment', `:overlay' and
-;; `:options' attributes (through ATTR_BEAMER affiliated keyword).
-;; The first one allows to use a different environment, the second
-;; sets overlay specifications and the last one inserts optional
-;; arguments in current list environment.
-;;
-;; Table of contents generated from "toc:t" option item are wrapped
-;; within a "frame" environment.  Those generated from a TOC keyword
-;; aren't.  TOC keywords accept options enclosed within square
-;; brackets (e.g. #+TOC: headlines [currentsection]).
-;;
-;; Eventually, an export snippet with a value enclosed within angular
-;; brackets put at the beginning of an element or object whose type is
-;; among `bold', `item', `link', `radio-target' and `target' will
-;; control its overlay specifications.
-;;
-;; On the minor mode side, `org-beamer-select-environment' (bound by
-;; default to "C-c C-b") and `org-beamer-insert-options-template' are
-;; the two entry points.
+;; document.  See Org manual for more information.
 
 ;;; Code:
 

lisp/ox-html.el

@@ -22,13 +22,7 @@
 ;;; Commentary:
 
 ;; This library implements a HTML back-end for Org generic exporter.
-
-;; To test it, run:
-;;
-;;   M-x org-html-export-as-html
-;;
-;; in an Org mode buffer.  See ox.el for more details on how this
-;; exporter works.
+;; See Org manual for more information.
 
 ;;; Code:
 

lisp/ox-icalendar.el

@@ -23,23 +23,9 @@
 ;;; Commentary:
 ;;
 ;; This library implements an iCalendar back-end for Org generic
-;; exporter.
+;; exporter.  See Org manual for more information.
 ;;
-;; It provides three commands for export, depending on the chosen
-;; source and desired output: `org-icalendar-export-to-ics' (current
-;; file), `org-icalendar-export-agenda-files' (agenda files into
-;; separate calendars) and `org-icalendar-combined-agenda-file'
-;; (agenda files into one combined calendar).
-;;
-;; It also provides `org-icalendar-export-current-agenda' function,
-;; which will create a calendar file from current agenda view.  It is
-;; meant to be called through `org-agenda-write'.
-;;
-;; This back-end introduces a new keyword, ICALENDAR_EXCLUDE_TAGS,
-;; which allows to specify a different set of exclude tags from other
-;; back-ends.
-;;
-;; It should follow RFC 5545 specifications.
+;; It is expected to conform to RFC 5545.
 
 ;;; Code:
 

lisp/ox-md.el

@@ -21,11 +21,8 @@
 ;;; Commentary:
 
 ;; This library implements a Markdown back-end (vanilla flavour) for
-;; Org exporter, based on `html' back-end.
-;;
-;; It provides two commands for export, depending on the desired
-;; output: `org-md-export-as-markdown' (temporary buffer) and
-;; `org-md-export-to-markdown' ("md" file).
+;; Org exporter, based on `html' back-end.  See Org manual for more
+;; information.
 
 ;;; Code: