genxlt utility messages

The messages issued by the genxlt utility have the following format:
EDCxxxx nn text <%n$x>
xxxx
Error message number
nn
Error severity
10
Warning message
30
Error message
%n$x
Substitution variable
%
The start of the substitution variable
n
The number that represents the line position of the variable
$
A delimiter
x
The kind of variable (d=decimal, s=string)