internal void RemoveNode(ILinkedElement elem)
{
AssertModifiable();
var lastElem = _content as ILinkedElement;
if (lastElem == null)
{
return;
}
_content = LinkedListOps.Remove(lastElem, elem);
}
internal void RemoveAttribute(Attribute attr)
{
AssertModifiable();
LinkedListOps.Remove(ref _lastAttr, attr);
}