Nested set model

NestedSetModel.cs

    public class NestedSetModelTest
    {
        public class Node
        {
            public Node(string value, params Node[] children)
            {
                Value = value;
                Children = children;
            }

            public string Value { get; private set; }
            public Node[] Children { get; private set; }
        }

        public void Test()
        {
            // Sample tree from http://en.wikipedia.org/wiki/Nested_set_model
            var tree =
                new Node("Clothing",
                    new Node("Men's",
                        new Node("Suits",
                            new Node("Slacks"),
                            new Node("Jackets")
                        )
                    ),
                    new Node("Women's",
                        new Node("Dresses",
                            new Node("Evening Gowns"),
                            new Node("Sun Dresses")
                        ),
                        new Node("Skirts"),
                        new Node("Blouses")
                    )
                );

            foreach (var e in GetSetEntries(0, 1, tree))
                Console.WriteLine(e);
        }

        public IEnumerable<Tuple<string, int, int, int>> GetSetEntries(int depth, int left, Node node)
        {
            var right = left + 1;
            foreach (var n in node.Children)
                foreach (var e in GetSetEntries(depth + 1, right, n))
                {
                    yield return e;
                    right = e.Item3 + 1;
                }

            yield return Tuple.Create(node.Value, left, right, depth);
        }
    }