On Wed, 14 Oct 2015, Matt Price wrote:

> On Wed, Oct 14, 2015 at 6:55 PM, Rasmus <rasmus@gmx.us> wrote:
>
>> Hi Matt,
>>
>> Matt Price <moptop99@gmail.com> writes:
>>
>>> a) add a horizontal rule
>>>
>>> pandoc expects a horizontal rule at each slide division.  So, if
>> possible,
>>> I would like to add an hhr element at the end of every headline.
>>
>> What’s a hhr element?
>>
>> <hr>, I meant
>
>> Can you just use something like
>> ---------------------------
>>
>> for a horizontal rule?  AFAIK, it’s inserted as "---".
>>
>> yes.  but then I will have to take out all the "---------------------"
> elements if I want to go back to using my original org documents again.
> The point is that I have lots of these lecture notes, and would prefer not
> to alter them too severely if possible.


Err, what about



--8<---------------cut here---------------start------------->8---
#+MACRO: hhr #+MD: ---

* abc

first slide

{{{hhr}}}

* def

second slide

{{{hhr}}}

--8<---------------cut here---------------end--------------->8---

>
>> b) speaker notes
>>>
>>> More importantly, org-reveal allows the use of speaker notes, thus:
>>>
>>> #+BEGIN_NOTES
>>>
>>> whatever I put here
>>>
>>> #+ END_NOTES
>>>
>>> is exported as:
>>>
>>> <aside class="speaker-notes">
>>> whaever I put here
>>> </aside>
>>
>> For me it’s inserted as
>>
>>
>> <div class="notes">
>> whatever I put here
>>
>> </div>
>>
>>
> yes, that's right, I was being hasty. In any case, what I would like to do
> is reproduce this behaviour in the markdown export; I have tried modifying
> the md export but I am doing something wrong, clearly, and had hoped to get
> some hints from the list...
>
>

Ok here is a hint. You can add a menu item if you really need it.


--8<---------------cut here---------------start------------->8---
#+BEGIN_SRC emacs-lisp
   (org-export-define-derived-backend
    'md-plus
    'md
    :translate-alist '(
 		      (export-block . org-md-plus-export-block))
    :export-block    '("NOTES"))

   (defun org-md-plus-export-block
       (export-block contents info)
     "Transcode a EXPORT-BLOCK NOTES element from Org to md-plus.
     CONTENTS is nil.  INFO is a plist holding contextual information."
     (if (equal (org-element-property :type export-block) "NOTES")
 	(concat "<aside class=\"speaker-notes\">\n"
 		(org-element-property :value export-block)
 		"</aside>\n")
       (let ((parent-backend (org-export-backend-parent backend)))
 	(if parent-backend
 	    (org-export-with-backend
 	     parent-backend export-block contents info)))))

#+END_SRC


#+BEGIN_NOTES
just for the note takers...
#+END_NOTES

: Run like this
: M-x (org-export-to-buffer 'md-plus "***md-plus-out***")
--8<---------------cut here---------------end--------------->8---


HTH,

Chuck