@1
Document does not exist!
@2
Document already exists!
@3
Illegal attempt to merge
identical documents!
@4
Illegal attempt to merge documents
when one document is the other's
(in-)direct successor!
@5
Illegal attempt to merge
documents of different types!
@6
Document is no 
basic revision!
@7
Cannot access document!
@8
Maximum number of merge
processes already active!
@9
Maximum number of
presentations displayed!
@10
WARNING: First pass aborted!
Rest is taken from first revision
@11
WARNING: Second pass aborted!
There are still multiply defined decls
@12
WARNING: Third pass aborted!
Still unbound appls are taken from first revision 
@13
Merge finished!
@14
Looking for differences
@15
First pass:
Merge contextfree part of documents
@16
Second pass:
Resolve multiple declarations
@17
Third pass:
Bind appls to decls
@301
Increments differ!
@302
Increment appears only
in this document!
@303
WARNING: Actual binding does not correspond
         to expected binding - 
         Modification impossible!
@304
ATTENTION: Expected binding ambiguous, but
           only one actually possible - 
           automatically bound! 
@305
ATTENTION: Automatically bound!
@306
ATTENTION: No binding possible! 
