Vol 54 contains some papers that were also part of Vol 53.
The file KRDB-Roger.pdf with the paper Toward Updates in Description Logics is present in both folders, and the index.html links to the file in its own folder
The file franconi.pdf with the paper Querying Objects with Description Logics is only present in Vol-53 and the index.html in Vol-54 links to the file on Vol-53
mcrusset.ps in Vol-53 and goasdoue.ps in Vol-54 both contain the paper Compilation and Approximation of Conjunctive Queries by Concept Descriptions. The index.html in Vol-53 links to Vol-54/goasdoue.ps

>>> The reason was that both events had a joint session. For consistency, I made sure that each folder contains all papers even though 
this leads to duplicates; added a suitable comment in index.html of Vol-53/Vol-54. The shared papers includes the invited talk lencirini.ps.


