/// <summary>
/// This method sets newArgument as the index-th argument of this element.
/// If there is currently an index-th argument, it is replaced by newArgument.
/// This frequently differs from setting the node at Node::childNodes().item(index),
/// as qualifier elements and declare elements are not counted.
/// </summary>
public MathMLElement SetArgument(MathMLElement newArgument, int index)
{
XmlNode node = arguments.Item(index);
if (node != null)
{
node = element.ReplaceChild(newArgument, node);
}
else if (index == arguments.Count + 1)
{
node = element.AppendChild(newArgument);
}
else
{
// this is bad, should throw some sort of exceptionb
}
return((MathMLElement)node);
}
