org.texi: Udpate ODT section

* doc/org.texi (Links in ODT export): Update.
(Labels and captions in ODT export): New node.

1 files changed, 67 insertions, 14 deletions

diff --git a/doc/org.texi b/doc/org.texi
index 3324888..6c13727 100644
--- a/doc/org.texi
+++ b/doc/org.texi
@@ -613,13 +613,14 @@ DocBook export
 OpenDocument Text export
 
 * Pre-requisites for ODT export::  What packages ODT exporter relies on
-* ODT export commands::  How to invoke ODT export
-* Extending ODT export:: How to produce @samp{doc}, @samp{pdf} files
+* ODT export commands::         How to invoke ODT export
+* Extending ODT export::        How to produce @samp{doc}, @samp{pdf} files
 * Applying custom styles::      How to apply custom styles to the output
-* Links in ODT export::  How links will be interpreted and formatted
-* Tables in ODT export::  How Tables are exported
-* Images in ODT export::  How to insert images
+* Links in ODT export::         How links will be interpreted and formatted
+* Tables in ODT export::        How Tables are exported
+* Images in ODT export::        How to insert images
 * Math formatting in ODT export::  How @LaTeX{} fragments are formatted
+* Labels and captions in ODT export::  How captions are rendered
 * Literal examples in ODT export::  How source and example blocks are formatted
 * Advanced topics in ODT export::  Read this if you are a power user
 
@@ -10799,13 +10800,14 @@ are compatible with LibreOffice 3.4.
 
 @menu
 * Pre-requisites for ODT export::  What packages ODT exporter relies on
-* ODT export commands::  How to invoke ODT export
-* Extending ODT export:: How to produce @samp{doc}, @samp{pdf} files
+* ODT export commands::         How to invoke ODT export
+* Extending ODT export::        How to produce @samp{doc}, @samp{pdf} files
 * Applying custom styles::      How to apply custom styles to the output
-* Links in ODT export::  How links will be interpreted and formatted
-* Tables in ODT export::  How Tables are exported
-* Images in ODT export::  How to insert images
+* Links in ODT export::         How links will be interpreted and formatted
+* Tables in ODT export::        How Tables are exported
+* Images in ODT export::        How to insert images
 * Math formatting in ODT export::  How @LaTeX{} fragments are formatted
+* Labels and captions in ODT export::  How captions are rendered
 * Literal examples in ODT export::  How source and example blocks are formatted
 * Advanced topics in ODT export::  Read this if you are a power user
 @end menu
@@ -10966,8 +10968,15 @@ the factory settings.
 @subsection Links in ODT export
 @cindex tables, in DocBook export
 
-The ODT exporter creates cross-references (aka bookmarks) for
-internal links.  It creates Internet-style links for all other links.
+ODT exporter creates native cross-references for internal links.  It creates
+Internet-style links for all other links.
+
+A link with no description and destined to a regular (un-itemized) outline
+heading is replaced with a cross-reference and section number of the heading.
+
+A @samp{\ref@{label@}}-style reference to an image, table etc. is replaced
+with a cross-reference and sequence number of the labelled entity.
+@xref{Labels and captions in ODT export}.
 
 @node Tables in ODT export, Images in ODT export, Links in ODT export, OpenDocument Text export
 @subsection Tables in ODT export
@@ -11116,7 +11125,7 @@ To create an image that is anchored to a page, do the following:
 [[./img.png]]
 @end example
 
-@node Math formatting in ODT export, Literal examples in ODT export, Images in ODT export, OpenDocument Text export
+@node Math formatting in ODT export, Labels and captions in ODT export, Images in ODT export, OpenDocument Text export
 @subsection Math formatting in ODT export
 
 The ODT exporter has special support for handling math.
@@ -11210,7 +11219,51 @@ or
 [[./equation.odf]]
 @end example
 
-@node Literal examples in ODT export, Advanced topics in ODT export, Math formatting in ODT export, OpenDocument Text export
+@node Labels and captions in ODT export, Literal examples in ODT export, Math formatting in ODT export, OpenDocument Text export
+@subsection Labels and captions in ODT export
+
+You can label and caption various category of objects - an inline image, a
+table, a @LaTeX{} fragment or a Math formula - using @code{#+LABEL} and
+@code{#+CAPTION} lines.  @xref{Images and tables}.  ODT exporter enumerates
+each labelled or captioned object of a given category separately.  As a
+result, each such object is assigned a sequence number based on order of it's
+appearance in the Org file.
+
+In the exported document, a user-provided caption is augmented with the
+category and sequence number.  Consider the following inline image in an Org
+file.
+
+@example
+#+CAPTION: Bell curve
+#+LABEL:   fig:SED-HR4049
+[[./img/a.png]]
+@end example
+
+It could be rendered as shown below in the exported document.
+
+@example
+Figure 2: Bell curve
+@end example
+
+@vindex org-export-odt-category-strings
+You can modify the category component of the caption by customizing the
+variable @code{org-export-odt-category-strings}.  For example, to tag all
+embedded images with the string @samp{Illustration} (instead of the default
+@samp{Figure}) use the following setting.
+
+@lisp
+(setq org-export-odt-category-strings
+      '(("en" "Table" "Illustration" "Equation" "Equation")))
+@end lisp
+
+With this, previous image will be captioned as below in the exported
+document.
+
+@example
+Illustration 2: Bell curve
+@end example
+
+@node Literal examples in ODT export, Advanced topics in ODT export, Labels and captions in ODT export, OpenDocument Text export
 @subsection Literal examples in ODT export
 
 Export of literal examples (@pxref{Literal examples}) with full fontification