public void Add(NodeFilter filter, NodeFilterSeperator seperator = NodeFilterSeperator.AND)
 {
     Filters.Add(new Tuple <NodeFilter, NodeFilterSeperator> (filter, seperator));
 }
 public void Add(NodeFilter filter, NodeFilterSeperator seperator = NodeFilterSeperator.AND)
 {
     Filters.Add (new Tuple<NodeFilter, NodeFilterSeperator> (filter, seperator));
 }