[O] How to change a link?

[Marcin Borkowski]

Hi list,

assume that I have a link object (e.g., I'm in the ellipsis part of
this:

(org-element-map (org-element-parse-buffer 'object) 'link
  (lambda (elt) ... ))

What I want to do is this:
1. check whether it is an internal link, and
2. if it is, change it so that it points to the analogous place in
another file.

Any hints about how to do these things?

(The rationale is that I'm writing a function which splits a single Org
file into a bunch of smaller ones, and I want to preserve links.)

Best,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Adam Mickiewicz University