From mboxrd@z Thu Jan  1 00:00:00 1970
From: Juan Pechiar <juan@pechiar.com>
Subject: Re: Multiline #+MACRO:
Date: Mon, 3 Dec 2012 18:28:47 -0200
Message-ID: <20121203202847.GA32043@soloJazz.com>
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To: Benny Simonsen <benny@slbs.dk>
Cc: emacs-orgmode@gnu.org

On Mon, Dec 03, 2012 at 08:28:26PM +0100, Benny Simonsen wrote:
> I would like to make a multiline macro that contains somethiing like this:
> #+ATTR_HTML: class="centerimg"
> file:./gallery/$1
>
> is it possible, and how?

Hi,

\n inside a macro definition gets expanded as a new-line.

So you can implement your macro thus:

#+MACRO myimg #+ATTR_HTML: class="centerimg"\nfile:./gallery/$1