The sctipt is useful for checking if linked files exest of not before generating output materials with DITA Open Toolkit.
Use it in package file before running DITA-OT. Example for BAT-file:
REM run script to check links. if error then exit and open errorpage with indicators
python %PATH_TO_SCRIPT%dita-xrefs.py
IF %ERRORLEVEL% == 1 (
pause
%PATH_TO_SCRIPT%xrefs.html
exit
)