Log files When you run the DITA-OT, key information is logged on the screen. This information also is written to a log file. If you encounter a problem, you can analyze this information to determine the source of the problem and then take action to resolve it.

The logging behavior varies depending on whether you use the DITA-OT command-line tool or Ant to invoke a toolkit build.

Ant
By default, status information is written to the screen. If you issue the -l parameter, the build runs silently and the information is written to a log file with the name and location that you specified. (You also can use other Ant loggers; see the Ant documentation for more information.)
Command-line tool
Status information is written to the screen and the log file. The log file name contains the input file name and transformation type; by default, it is located in the output directory. If you issue the /logdir parameter, you can specify a different location for where the log file is written.