Chapter 12: Exporting
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 in-
serted in the output. This special value is useful to have data between frames, or to
properly close a column environment.
Headlines also support BEAMER_ACT and BEAMER_OPT properties. The former is trans-
lated as an overlay/action speciﬁcation, or a default overlay speciﬁcation when enclosed
within square brackets. The latter speciﬁes options
for the current frame or block. The
export back-end will automatically wrap properties within angular or square brackets when
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
Xenvironment. 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).
12.5.4 Beamer speciﬁc syntax
The Beamer back-end is an extension of the LAT
Xback-end. As such, all LAT
syntax (e.g., ‘#+LATEX:’ or ‘#+ATTR_LATEX:’) is recognized. SeeSection12.7[L
PDF export], page 156formoreinformation.
Table of contents generated from toc:t OPTION keyword are wrapped within a frame
environment. Those generated from a TOC keyword (see[Tableofcontents],page129 ) are
not. In that case, it is also possible to specify options, enclosed within square brackets.
#+TOC: headlines [currentsection]
Beamer speciﬁc code can be inserted with the following constructs:
All lines in this block will appear only when using this back-end.
Text @@beamer:some code@@ within a paragraph.
In particular, this last example can be used to addoverlay speciﬁcations to objects whose
type is among bold, item, link, radio-target and target, when the value is enclosed
within angular brackets and put at the beginning the object.
The fragile option is added automatically if it contains code that requires a verbatim environment,