public static int Main(string[] args)
    {
        if (args.Length != 1)
        {
            Console.WriteLine("Usage: printUnits filename");
            return(1);
        }

        string       filename = args[0];
        SBMLDocument document = libsbml.readSBML(filename);

        if (document.getNumErrors() > 0)
        {
            Console.Error.WriteLine("Encountered the following SBML errors:");
            document.printErrors();
            return(1);
        }

        Model model = document.getModel();

        if (model == null)
        {
            Console.WriteLine("No model present.");
            return(1);
        }

        int i, j;

        for (i = 0; i < model.getNumSpecies(); i++)
        {
            Species s = model.getSpecies(i);
            Console.WriteLine("Species " + i + ": "
                              + UnitDefinition.printUnits(s.getDerivedUnitDefinition()));
        }

        for (i = 0; i < model.getNumCompartments(); i++)
        {
            Compartment c = model.getCompartment(i);
            Console.WriteLine("Compartment " + i + ": "
                              + UnitDefinition.printUnits(c.getDerivedUnitDefinition()))
            ;
        }

        for (i = 0; i < model.getNumParameters(); i++)
        {
            Parameter p = model.getParameter(i);
            Console.WriteLine("Parameter " + i + ": "
                              + UnitDefinition.printUnits(p.getDerivedUnitDefinition()))
            ;
        }


        for (i = 0; i < model.getNumInitialAssignments(); i++)
        {
            InitialAssignment ia = model.getInitialAssignment(i);
            Console.WriteLine("InitialAssignment " + i + ": "
                              + UnitDefinition.printUnits(ia.getDerivedUnitDefinition()));
            Console.WriteLine("        undeclared units: ");
            Console.WriteLine((ia.containsUndeclaredUnits() ? "yes\n" : "no\n"));
        }

        for (i = 0; i < model.getNumEvents(); i++)
        {
            Event e = model.getEvent(i);
            Console.WriteLine("Event " + i + ": ");

            if (e.isSetDelay())
            {
                Console.WriteLine("Delay: "
                                  + UnitDefinition.printUnits(e.getDelay().getDerivedUnitDefinition()));
                Console.WriteLine("        undeclared units: ");
                Console.WriteLine((e.getDelay().containsUndeclaredUnits() ? "yes\n" : "no\n"));
            }

            for (j = 0; j < e.getNumEventAssignments(); j++)
            {
                EventAssignment ea = e.getEventAssignment(j);
                Console.WriteLine("EventAssignment " + j + ": "
                                  + UnitDefinition.printUnits(ea.getDerivedUnitDefinition()));
                Console.WriteLine("        undeclared units: ");
                Console.WriteLine((ea.containsUndeclaredUnits() ? "yes\n" : "no\n"));
            }
        }

        for (i = 0; i < model.getNumReactions(); i++)
        {
            Reaction r = model.getReaction(i);

            Console.WriteLine("Reaction " + i + ": ");

            if (r.isSetKineticLaw())
            {
                Console.WriteLine("Kinetic Law: "
                                  + UnitDefinition.printUnits(r.getKineticLaw().getDerivedUnitDefinition()));
                Console.WriteLine("        undeclared units: ");
                Console.WriteLine((r.getKineticLaw().containsUndeclaredUnits() ? "yes\n" : "no\n"));
            }

            for (j = 0; j < r.getNumReactants(); j++)
            {
                SpeciesReference sr = r.getReactant(j);

                if (sr.isSetStoichiometryMath())
                {
                    Console.WriteLine("Reactant stoichiometryMath" + j + ": "
                                      + UnitDefinition.printUnits(sr.getStoichiometryMath().getDerivedUnitDefinition()));
                    Console.WriteLine("        undeclared units: ");
                    Console.WriteLine((sr.getStoichiometryMath().containsUndeclaredUnits() ? "yes\n" : "no\n"));
                }
            }

            for (j = 0; j < r.getNumProducts(); j++)
            {
                SpeciesReference sr = r.getProduct(j);

                if (sr.isSetStoichiometryMath())
                {
                    Console.WriteLine("Product stoichiometryMath" + j + ": "
                                      + UnitDefinition.printUnits(sr.getStoichiometryMath().getDerivedUnitDefinition()));
                    Console.WriteLine("        undeclared units: ");
                    Console.WriteLine((sr.getStoichiometryMath().containsUndeclaredUnits() ? "yes\n" : "no\n"));
                }
            }
        }

        for (i = 0; i < model.getNumRules(); i++)
        {
            Rule r = model.getRule(i);
            Console.WriteLine("Rule " + i + ": "
                              + UnitDefinition.printUnits(r.getDerivedUnitDefinition()));
            Console.WriteLine("        undeclared units: ");
            Console.WriteLine((r.containsUndeclaredUnits() ? "yes\n" : "no\n"));
        }

        return(0);
    }