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[O] #+ATTR_MY-ASCII: in derived backend?

From: Thorsten Jolitz
Subject: [O] #+ATTR_MY-ASCII: in derived backend?
Date: Sun, 22 Sep 2013 11:04:31 +0200
User-agent: Gnus/5.130002 (Ma Gnus v0.2) Emacs/24.3 (gnu/linux)

Hi List, 

do derived backends set their attributes always via the 


construct of the parent backend and don't have their own 



The following excerpt from the manual suggests this - and I actually
tried it out and the latter is not added as ':attr_my-backend "value"'
to the property list of the following element, but the former is added
as ':attr_backend "value"'.

| As an example, imagine we want the ascii back-end to display the
| language used in a source block, when it is available, but only when
| some attribute is non-nil, like the following:
|      #+ATTR_ASCII: :language t
| Because that back-end is lacking in that area, we are going to create a
| new back-end, my-ascii that will do the job.
|      (defun my-ascii-src-block (src-block contents info)
|        "Transcode a SRC-BLOCK element from Org to ASCII.
|      CONTENTS is nil.  INFO is a plist used as a communication
|      channel."
|        (if (not (org-export-read-attribute :attr_ascii src-block :language))
|          (org-export-with-backend 'ascii src-block contents info)
|        (concat
|         (format ",--[ %s ]--\n%s`----"
|                 (org-element-property :language src-block)
|                 (replace-regexp-in-string
|                  "^" "| "
|                  (org-element-normalize-string
|                   (org-export-format-code-default src-block info)))))))
|      (org-export-define-derived-backend 'my-ascii 'ascii
|        :translate-alist '((src-block . my-ascii-src-block)))

But OTOH, aren't things like 


working although its a derived backend? 


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