Requirement
1) qgis
2) sextante_taudem (TauDEM-1.1.1.zip)
3) sextante (sextante-1.0.9.zip)
4) PYTHONPATH=.:/usr/lib/otb/python:/usr/share/qgis/python/plugins:~/.qgis2/python/plugins
5) ITK_AUTOLOAD_PATH=/usr/lib/otb/applications 

Creating xml files
cd .qgis2/python/plugin/sextante/otb/maintenance
python ./OTBHelper.py