Org mode 8 no longer accepts LaTeX characters like that. The correct way to do it is embed export snippets in the title:
#+TITLE: Foo @@latex:\\@@ Bar
I assume therefore that if you want to export newlines in both LaTeX and HTML, the code might have to look like this:
#+TITLE: Foo @@latex:\\@@ @@html:<br>@@ Bar
Source: https://lists.gnu.org/archive/html/emacs-orgmode/2014-09/msg00466.html
If such newline characters are needed to be added at multiple places in the document, replacing this verbose @@latex:\\@@ @@html:<br>@@ string with an org mode MACRO would be better suited.
A MACRO definition like below can be placed at the top of the document or in a common "org config" file that's included in your org documents:
#+MACRO: NEWLINE @@latex:\\@@ @@html:<br>@@
The MACRO can then be used for formatting the title as below:
#+TITLE: Foo {{{NEWLINE}}} Bar
The advantages of using the MACRO approach are:
- The org mode document is easier to read
- If the need arises to change the definition of
{{{NEWLINE}}}to support a new export format, then that change needs to be done at just one place.
Example:
#+MACRO: NEWLINE @@latex:\\@@ @@html:<br>@@ @@ascii:|@@
NOTE: @@ascii:|@@ won't insert a newline in ascii exports; it will simply place the pipe character | wherever {{{NEWLINE}}} was used in the org doc.
Finally, the #+SUBTITLE keyword may also help.
