read file, convert to XPP

write to a file

SBMLWrite[inputfile-> "repressilator.xml", outputfile-> "rep.ode", format-> "XPP"]

rep.ode

same thing, but write output to the screen

SBMLWrite[inputfile-> "repressilator.xml", format-> "XPP"]

# Model Name:    Repressilator Model\n#\n# Creation Time: 26-November-2003 ... init repressilator_py=Indeterminate\ninit repressilator_px=5.\ninit repressilator_pz=15.\n# \ndone

Created by Mathematica  (February 27, 2004)