Hi macropod,

Thank you for the answer.
Actually I use distinct master lists for each chapter, which makes it more difficult I guess.
I generated the xml file myself (with small C program), and I chose to give a number for the "Tag" field. The numbers go from 1 to N, where N is the number of references in the master list.
If I generate a new master list, merging all the references, the numbering (for Tags) will therefore change. The link with citations in the text will thus be mixed up...

What would you advise me to do here?

Your help is really appreciated. Thank you.
Florian