From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: Get :PROPERTY: value from drawer in other heading during HTML
 export?
Date: Fri, 12 Sep 2014 21:06:32 +0200
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	(D. C. Toedt's message of "Fri, 12 Sep 2014 09:54:11 -0500")
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To: "D. C. Toedt" <dc@toedt.com>
Cc: emacs-orgmode@gnu.org

Hello,

"D. C. Toedt" <dc@toedt.com> writes:

> When generating an HTML file from an org-mode document, I'd like to do a
> GET operation to retrieve a property value from the drawer of an arbitrary
> heading, using the CUSTOM_ID property to identify the heading.  From
> Google-searching, I suspect that "org-heading-components" will be involved,
> but I'm not proficient enough in elisp to be able to figure out how to use
> it from the on-line examples I've found --- and I'm not proficient enough
> in Emacs to use any built-in documentation about it ("apropos" doesn't
> produce any results).
>

[...]

> #+MACRO: get-title [omitted -- thanks to Nicolas Goaziou for the get-title
> macro, at
>
> https://lists.gnu.org/archive/html/emacs-orgmode/2014-02/msg00386.html]

You can use the same macro, replacing

  (org-get-heading nil nil) 

with

  (org-entry-get (point) "$2")

IOW,

  #+MACRO: GET-PROP (eval (or (save-excursion (ignore-errors (let ((org-link-search-inhibit-query t)) (org-open-link-from-string "[[#$1]]") (org-entry-get (point) "$2")))) "UNKNOWN VALUE"))


Regards,

-- 
Nicolas Goaziou