Multi-parameter anonymous types?

Question

I recenty stumbled upon a piece of LINQ code written below var cons = xdoc.Descendants( "xref" )           .Where(x=>x.Attribute( "rid" ).Value.Contains( "ref" ))           .GroupBy(x=>x.Parent)           .Select(grp=>  new                    {                       Parent = grp.Key,                       ConsecutiveNodes = grp.Select((n, i)=>  new                                                      {                                                       Index = i+1,                                                       Node = n                                                     }),                       Count = grp.Count()                   })           .ToList();
Now I cannot understand the part .Select(grp=>  new                      {                         Parent = grp.Key,                         ConsecutiveNodes = grp.Select((n, i)=>  new                                                        {                                                         Index = i+1,                                                         Node = n                                                       }),                         Count = grp.Count()                     })
Can anyone break it down for me because I cannot figure it out on my own, there are a lot of new things that I haven't seen before...like an anonymous type inside and anonymous type? and what is the grp.Select((n, i) thing? how does it work?

Laxmidhar Sahoo · Answer

In my knowledge n is the character and I is the index