Currently, xclip only allows to copy to and paste from the three standard selections.
However, ICCCM 2.6.1 mentions that more selections can exist:
There can be an arbitrary number of selections, each named by an atom. To conform with the inter-client conventions, however, clients need deal with only these three selections:
PRIMARY
SECONDARY
CLIPBOARD
Other selections may be used freely for private communication among related groups of clients.
Currently, xclip only allows to copy to and paste from the three standard selections. However, ICCCM 2.6.1 mentions that more selections can exist:
(https://tronche.com/gui/x/icccm/sec-2.html#s-2.6.1)
I wish for xclip to support selections of custom names.
This blog post might help a bit: https://www.uninformativ.de/blog/postings/2017-04-02/0/POSTING-en.html