[O] Get :PROPERTY: value from drawer in other heading during HTML export?

[D. C. Toedt]

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).

Here's an example, where GET-PROP is a macro I'd like to use:

==BEGIN==

#+MACRO: get-prop [????]

#+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]

* CLAUSES

** Affiliate status from voting control

  :PROPERTIES:

  :CUSTOM_ID: AffilDefn

  :CD-ID: AFFIL-VOTE

  :IMPORTANCE: Situational

  :PUSHBACK: Unlikely

  :END:

(a) One individual or organization ("Person") is an {{{DEFN(Affiliate)}}} of another Person if,  directly or indirectly via one or more intermediaries, one of those Persons /controls/ (as defined in subdivision (b) below), or is controlled by, or is under common control with, the other Person.

(b) [other text omitted]

* CONTRACT TEMPLATES

** Nondisclosure Agreement

{{{GET-PROP(AffilDefn,CD-ID)}}}: {{{GET-TITLE(AffilDefn)}}} -- pushback from the other side is {{{GET-PROP(AffilDefn,PUSHBACK)}}}.

# This should export to:    

# AFFIL-VOTE: Affiliate status from voting control -- pushback from the other side is: Unlikely.

==END==

Thanks in advance,

--D. C. 

Dell Charles "D. C." Toedt III  (my last name is pronounced "Tate") 

Attorney and neutral arbitrator -- tech contracts and intellectual property
Lecturer, University of Houston Law Center

​Editor, ​​​Common Draft project:  A readable library of best-practices contract clauses,
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