[xsl] group together subsequent elements?

[Matěj Cepl <mcepl@xxxxxxxxxx>]

Hi,

I am probably missing something very obvious, but I have not found a way 
how to combine group of same elements into one. Meaning, I have on input

n.: <spoj>mC!m</spoj> <spoj>zalC-benC-</spoj>

and I would like to get on output

n.: <linked>mC!m zalC-benC-</linked>

(number of elements in one group can vary).

Do I miss something completely trivial or it is one of those things 
which XSLT cannot do?

Thanks in advance for any response,

MatDj