If the given index {@code n} is out of range for this {@link XMLNode} instance,the {@code node} is added at the end of the list of children. Even inthat situation, this method does not throw an error.
@param n an integer, the index at which the given node is inserted @param node an {@link XMLNode} to be inserted as {@code n}th child.
@return a reference to the newly-inserted child {@code node}
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