https://localserver.tld/applicationname/objtype/NNNNNID/=ap_id@remoteserver.tld
https://localserver.tld/applicationname/objtype/NNNNNID/!conf@remoteserver.tld
https://localserver.tld/applicationname/objtype/NNNNNID/user@remoteserver.tld

and distinguish them with regular expressions at reverse proxy…

in another software it’s possible to use:
p?ap_id@server
c?conf@server
u?user@server
where this local links will be added to URI ending with trailing /

i.e. https://engine.tld/application/objtype/NNNNNID/
will be completed with
https://localserver.tld/applicationname/objtype/NNNNNID/p?ap_id@remoteserver.tld
https://localserver.tld/applicationname/objtype/NNNNNID/c?conf@remoteserver.tld
https://localserver.tld/applicationname/objtype/NNNNNID/u?user@remoteserver.tld

This way the local links will allow to setup redirects to any type of objects.
(and without the special syntax and special parsing)

I expected some special syntax like post:id!community@domain

Or ap_id?post/15@xn--e1aghfa.xn--e1aqbccjfc.xn--p1acf

Here ap_id is the name of part of URI, which maps to
https://lemmy.ml/post/ap_id
and performs all the magic, which lemmyverse.link does

Or https://lemmy.ml/post/49064481?15@xn--e1aghfa.xn--e1aqbccjfc.xn--p1acf
if developers will integrate it into lemmy itself

?=post/15@xn--e1aghfa.xn--e1aqbccjfc.xn--p1acf - any ap_id

?!community@xn--e1aghfa.xn--e1aqbccjfc.xn--p1acf - any community
?usernick@xn--e1aghfa.xn--e1aqbccjfc.xn--p1acf - any user
but the last two options are not necessary

I created this topic on my own instance. It knows original ID, but doesn’t know ID-s in all other servers in federation.

I want to write a link in such a way, that lemmy substitute it with the reference to the local copy of message on lemmy.ml server.

But now lemmy just shows an original link to my server.

I enter xn--e1aghfa.xn--e1aqbccjfc.xn--p1acf into the field of https://lemmyverse.link/ when it asks my home. But the site doesn’t accept that perfectly RFC952 compliant name