Ah! I made a typo in the example above; here's the corrected one:

* Link source
:PROPERTIES:
:EXPORT_FILE_NAME: link-source
:END:
- Link to [[#link-dest][Link dest]]
* Link dest
:PROPERTIES:
:EXPORT_FILE_NAME: link-dest
:CUSTOM_ID: link-dest
:END:

("Link source" and "Link dest" subtrees are at the same level. So exporting
just "Link source" subtree does not 'see' the "Link dest" subtree.)

On Fri, Jul 28, 2017 at 3:17 PM Kaushal Modi <kaushal.modi@gmail.com> wrote:

> Hello,
>
> Is there a way to make org-export-resolve-id-link look for link resolution
> outside the current scope?
>
> I just threw in a (save-restriction (widen) ..) inside
> org-export-resolve-id-link, and that of course did not work (and thus this
> email).
>
> Below is a little example:
>
> * Link source
> :PROPERTIES:
> :EXPORT_FILE_NAME: link-source
> :END:
> - Link to [[#link-dest][Link dest]]
> ** Link dest
> :PROPERTIES:
> :EXPORT_FILE_NAME: link-dest
> :CUSTOM_ID: link-dest
> :END:
>
> - I would like to export just the "Link source" subtree (let's say C-c C-e
> C-s t A), and have the link resolve to the "link-dest" CUSTOM_ID.
> - To put this the other way, I want to export just the subtree, but look
> at the whole buffer for link resolution.
>
> I know that does not make sense, but I need that for the Hugo exporter
> backend.
>
> Application: I have one subtree (Hugo post) containing a CUSTOM_ID based
> internal link to some other subtree (Hugo post), and I want to retain the
> link reference. Hugo would then figure out the rest.
>
> What function could I advice and with what to make this happen?
>
> Thanks.
> --
>
> Kaushal Modi
>
-- 

Kaushal Modi