public int addUnknownPackageRequired(string pkgURI, string prefix, bool flag)
{
int ret = libsbmlPINVOKE.SBMLDocument_addUnknownPackageRequired(swigCPtr, pkgURI, prefix, flag);
if (libsbmlPINVOKE.SWIGPendingException.Pending) throw libsbmlPINVOKE.SWIGPendingException.Retrieve();
return ret;
}