From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Vladimir Alexiev" <vladimir.alexiev@ontotext.com>
Subject: allow multiline #+BIND
Date: Wed, 30 Jul 2014 14:33:47 +0300
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To: emacs-orgmode@gnu.org

It would be nice to allow multiline BINDs. I'd much rather write this than put it all on one line:

#+BIND: va/org-dot-preamble "digraph g {
#+BIND:   rankdir=LR nodesep=0.2 ranksep=0.1 arrowsize=0.2
#+BIND:   node [fontname=courier fontsize=8 margin='0.02,0.01' shape=circle width=0.1 height=0.1 label='']
#+BIND:   edge [fontname=courier fontsize=8 labelfontname=courier labelfontsize=8]"

The usual continuation syntax of backslash before the EOL can be used.
Or else, a new keyword #+BIND1: for each continuation line.

The function to fix is ox.el::org-export--list-bound-variables